LiquidAlchemy

Hey, I am a new user and was attempting to map buttons for my X-arcade. I cleared the select input without assigning a new button first and now I can't select anything on the menu at all to fix it! I've tried uninstalling and reinstalling to no avail. I've also tried to plug in a new controller but that doesn't work either. Even the enter button on my laptop won't select and the touchscreen or mouse don't work in bigbox. In launchbox I can't see where to find the same mapping that carries over into Bigbox. Any help would be appreciated!