I want to have different controls. I’m doing a platformer. I’m using the platformer behavior. How do I change the default controls to custom controls becasue there’s a checkmark box there so I’m wondering how do the custom controls since every time I unfill the check mark and try to fill in the code, the character sprite won’t move. 
If you disable default key, you should then use condition and action to simulate :
the key “D” is pressed" then “simulate right key”.
Sorry about not being accurate, i don’t have Gdevelop installed where i’m right now, and i don’t use it in english. But you should find these actions to simulate a key press for platformer in platformer folder in actions list.
I changed basic platfomer tutorial:
Download link: http://www.speedyshare.com/TbbRG/platformerCustomKeys.zip