First of all, make sure that you have the latest version of Surge. You do? All right, the next step is to try to force quit the app (double tapping the Home button on the iPhone or in Settings/Apps/Surge/Force Quit on Android).
If you still can’t log in, please reach out to us on firstname.lastname@example.org. Please send us any information that can help us find your account - your username, birthday date, e-mail associated with your Surge account, something you wrote in the"About" section or photos you use on your profile. We will do our best to help you find your account!