Replying to Rail help?

so im new to freestyle and im just learning stuff in the park cause i have always been a pow skier more or just all mountain depends on how lucky i am :) buuut anyways i was trying to hit a rail the other day it was like a super sketchy rail out of pvc at my local hill it was a temporary little mini park and whenever someone would hit it it would bend and/or get pushed a lot (the rail was like a 4-5 inch diameter handrail).

anyways when i tried to do it (which was my first time ever trying a rail), i skied up to the right side of the lip and i popped up and got on it but the problem was that like i was almost jumping over it or something cause when i got on i would be on it for like a little bit then just slide off the left side about 2 thirds of the way down maybe less.

anyone know how to fix this? i tried widening my stance but it didn't work.. almost like i wasn't on the center of my foot.
thanks +k