A. If you find yourself stuck on a payment screen, try tapping the back button on your device or swiping down from the top of the screen to access the notification panel. Sometimes, this can help you exit the screen without completing a payment.
B. If the app is unresponsive, force close it by going to your device's settings, selecting 'Apps', finding Joymeet, and tapping 'Force Stop'. Then, reopen the app to see if you can navigate away from the payment screen.