If you mean the game controls, use the Options button on the main menu or Ctrl+O in-game and then edit them.
If you mean an event button, use the Brick->setEventEnabled and Brick->toggleEventEnabled events. Inputting a set of numbers into the events will let you activate and de-activate certain events on the brick - toggleEventEnabled [0 1 2 3] will toggle the first four events of the brick on or off depending on what they previously were, with the checkbox next to the event number.