In order to change your email, it will depend on the platform you are running the app. On iOS or Android, tap the menu button in the top left corner of the app, tap Settings, then tap Account Settings. On Mac, open mSecure and click "mSecure > Preferences" in the top left corner of your screen. In the Preferences, click the "Accounts" tab. On Windows, open mSecure and click the gear icon in the bottom left corner. In the Settings screen, click "Account Settings."