Skatboarding - Ollie Help Please?

Hey guys, as you can tell by the title i need help on ollieing (however you spell that). I can pop the board fine, it's just that my foot doesn't slide up the board. It just goes up. I try my hardest to slide my foot up the board, but I just can't get the two left wheels in the air. Can someone help me and tell me what to do? I know HOW to ollie, I just can't. (By the way, my board is fake, please don't answer saying, "Get a real board".)