web/app/settings/views/settingsTwoFactor.html

<div class="modal-header">
    <button type="button" class="close" ng-click="close()" aria-label="Close"><span aria-hidden="true">&times;</span></button>
    <h4 class="modal-title" id="twoFactorModelLabel"><i class="fa fa-key"></i> Two-step Log In</h4>
</div>
<form name="authTwoStepForm" ng-submit="authTwoStepForm.$valid && auth(authModel)" api-form="authPromise"
      ng-if="!twoFactorModel">
    <div class="modal-body">
        <p ng-show="enabled()">
            Two-step log in is already enabled on your account. To access your two-step
            settings enter your master password below.
        </p>
        <p ng-show="!enabled()">To get started with two-step log in enter your master password below.</p>
        <div class="callout callout-danger validation-errors" ng-show="authTwoStepForm.$errors">
            <h4>Errors have occured</h4>
            <ul>
                <li ng-repeat="e in authTwoStepForm.$errors">{{e}}</li>
            </ul>
        </div>
        <div class="form-group" show-errors>
            <label for="masterPassword">Master Password</label>
            <input type="password" id="masterPassword" name="MasterPasswordHash" ng-model="authModel.masterPassword"
                   class="form-control" required api-field />
        </div>
    </div>
    <div class="modal-footer">
        <button type="submit" class="btn btn-primary btn-flat" ng-disabled="authTwoStepForm.$loading">
            <i class="fa fa-refresh fa-spin loading-icon" ng-show="authTwoStepForm.$loading"></i>Continue
        </button>
        <button type="button" class="btn btn-default btn-flat" ng-click="close()">Close</button>
    </div>
</form>
<form name="updateTwoStepForm" ng-submit="updateTwoStepForm.$valid && update(updateModel)" api-form="updatePromise"
      ng-if="twoFactorModel">
    <div class="modal-body">
        <div ng-show="enabled()">
            <div class="callout callout-success">
                <h4><i class="fa fa-check-circle"></i> Enabled</h4>
                <p>
                    Two-step log in is enabled on your account. Incase you need to add it to another device, below is the QR
                    code (or key) required by your verification app.
                </p>
            </div>
            <p>Need a two-step verification app? Download one of the following:</p>
        </div>
        <div ng-show="!enabled()">
            <p>Setting up two-step verification is easy, just follow these steps:</p>
            <h4>1. Download a two-step verification app</h4>
        </div>
        <ul class="fa-ul">
            <li>
                <i class="fa-li fa fa-apple fa-lg"></i>
                iOS devices:
                <a href="https://itunes.apple.com/us/app/authy/id494168017?mt=8" target="_blank">
                    Authy for iOS
                </a>
            </li>
            <li>
                <i class="fa-li fa fa-android fa-lg"></i>
                Android devices:
                <a href="https://play.google.com/store/apps/details?id=com.authy.authy" target="_blank">
                    Authy for Android
                </a>
            </li>
            <li>
                <i class="fa-li fa fa-windows fa-lg"></i>
                Windows devices:
                <a href="https://www.microsoft.com/en-us/store/apps/authenticator/9wzdncrfj3rj" target="_blank">
                    Microsoft Authenticator
                </a>
            </li>
        </ul>
        <p>These apps are recommended, however, other authenticator apps will also work.</p>
        <hr ng-show="enabled()" />
        <h4 ng-show="!enabled()" style="margin-top: 30px;">2. Scan this QR code with your verification app</h4>
        <div class="row">
            <div class="col-md-4 text-center">
                <p><img ng-src="{{twoFactorModel.qr}}" alt="QR" class="img-thumbnail" /></p>
            </div>
            <div class="col-md-8">
                <p>
                    <strong>Can't scan the code?</strong> You can add the code to your application manually using the
                    following details:
                </p>
                <ul class="list-unstyled">
                    <li><strong>Key:</strong> <code>{{twoFactorModel.key}}</code></li>
                    <li><strong>Account:</strong> {{account}}</li>
                    <li><strong>Time based:</strong> Yes</li>
                </ul>
            </div>
        </div>
        <div ng-show="enabled()">
            <hr />
            <div class="callout callout-warning">
                <h4><i class="fa fa-warning"></i> Recovery Code <i class="fa fa-warning"></i></h4>
                <p>
                    The recovery code allows you to access your account in the event that you lose your authenticator app.
                    bitwarden support won't be able to assist you if you lose access to your account. We recommend
                    you write down or print the recovery code below and keep it in a safe place.
                </p>
                <p><strong>Recovery Code:</strong> <code>{{twoFactorModel.recovery}}</code></p>
                <button type="button" class="btn btn-default" ng-click="print(twoFactorModel.recovery)">
                    <i class="fa fa-print"></i> Print
                </button>
            </div>
        </div>
        <hr ng-show="enabled()" />
        <div class="callout callout-danger validation-errors" ng-show="updateTwoStepForm.$errors">
            <h4>Errors have occured</h4>
            <ul>
                <li ng-repeat="e in updateTwoStepForm.$errors">{{e}}</li>
            </ul>
        </div>
        <h4 style="margin-top: 30px;">
            <span ng-show="enabled()">Want to disable? </span><span ng-show="!enabled()">3. </span>
            Enter the resulting verification code from the app
        </h4>
        <div class="form-group" show-errors>
            <label for="token" class="sr-only">Verification Code</label>
            <input type="text" id="token" name="Token" placeholder="Verification Code" ng-model="updateModel.token"
                   class="form-control" required api-field />
        </div>
        <p ng-show="!enabled()">
            NOTE: After enabling two-step log in, you will be required to enter the current code
            generated by your verification app each time you log in.
        </p>
    </div>
    <div class="modal-footer">
        <button type="submit" class="btn btn-primary btn-flat" ng-disabled="updateTwoStepForm.$loading">
            <i class="fa fa-refresh fa-spin loading-icon" ng-show="updateTwoStepForm.$loading"></i>
            <span ng-show="enabled()">Disable Two-step</span>
            <span ng-show="!enabled()">Enable Two-step</span>
        </button>
        <button type="button" class="btn btn-default btn-flat" ng-click="close()">Close</button>
    </div>
</form>