help pls

how to perform alley oop on keyboard?? don't know how to perform a backdown.. pls help me im a newbie

Backdown is the button you use to post up. Just check in controller settings which button is assigned for this function. And then backdown+pass, that's it.

just to add one more thing, you will only do the alley-oop if the player you will do the oop for is running to the basket, if he's standing you will only perform a pass