Make a Sprite Change 90 Degree Direction

I'm working on a prototype for my game involving a square collecting stars in a stage that has a goal. Every time the player Mouse clicks/Keyboard taps, the square goes in another 90 angle direction (from EAST to SOUTH to WEST to NORTH to EAST...). When the square collides with a wall, the square goes backwards in a 180 angle direction.

I've been able to get the Wall collision working properly but the 90 angle direction change for every Mouse click/Keyboard tap isn't working. What is required in the Event List to have the square turn 90 degrees with every click/tap?

Is it a regular square? 90 degrees wont show an effect, because a square will always be on its side.. but... if not, you do this...

every click, or clicked on object, set angle to Sprite.Angle + 90

Objects return data members through dot notation. If you type your sprite name and period, you'll see what can be returned... current angle, current x,y, some other stuff...

All sprites have an "Angle" parameter that you can either set manually or via event. Just do like:

Sprite: Set angle: Sprite.angle + 90

Like JeremyBenson11 says.

Ah yes, I forgot about the Object.Angle usage. This did work. Thanks to you both.