First open the UltraVPN app.
Next, tap the Sign in button in the app
You'll then be asked to enter your email address and password. Enter the login credentials you use to sign in to Ultra Antivirus, and click on Continue.
The next step is entering your password. If you haven't yet set a password for UltraAV, please follow the instructions in the article How do I set a password for Ultra Antivirus' products?
After entering your login credentials, you'll be logged in to UltraVPN.