To log out of Ultra Antivirus on Android, first open the Ultra Antivirus app.
Once in the app, click on the Profile button in the upper-left corner.
You'll be taken to a screen where you can see details about your account, such as your email address. Ro proceed, click on Account.
This will take you to a new screen with a Sign Out button. Click on Sign Out to log out of the application.
Do note that logging out of the application will not cancel your subscription or delete the app.