got stuck in the change controls tab trying to change the tool, then every time I tried to press something else it would just change the tool button to whatever I pressed and not do anything, couldn't leave the menu or anything
To change a control, select what you want to change, then hit the key you want to change it to (it sounds like you already did this as it changed the tool button). Afterwards, you MUST hit okay - if you hit cancel it will undo any changes you made while the control window was open, and if you hit reset, it will reset all controls to defaults.