Skaters – need help to do an ollie in motion?

I ollie kickflip stasionary and even moving! But when I try to ollie my back foot move fire and earth with one foot. Or my foot slides off my foot a lot and will pass by the screws on the nose and my other foot is on the tail, so I have to stop or I fall. I need help you can learn to ollie of things like stairs and steps. Thanks

try putting your back foot closer to the screws behind, for example, dont have hung back as much. maybe you're dragging a bit.

Advanced Street Skateboarding : How to Ollie Down a Set of Stairs on a Skateboard