I don't understand at all how you could be stuck.....
Are you afraid to exit?
You mention "click".... most BIOS utilities support navigating with your keyboard arrow keys, space bar and return key
Can you not use F10 or similar key to exit, choosing to save or discard changes.
Can you not choose "default" or "optimal default" usually something like that is available to fix anything you might have changed.
IS the computer automatically opening the BIOS screen everytime you shut it down and restart it??
Have you tried shutting it down, removing AC adapter and battery, pressing and holding the power button and then putting the battery back and reconnecting the AC power and booting the system??
Do you suspect something catastrophic happened like a failed firmware update?