I'd recommend using the built-in behaviours inside of Construct 2 for this, but, if you want to do it this way you could add subevents to those events, so, for example:
The player presses the up arrow key move the player 32 pixels up, check if it is overlaping the wall object and if it is move the player 32 pixels down.
Here's a .capx:
Collision
I also altered the collision box to be a little smaller. It mustn't touch the edges of the sprite.