You want to approach the rail with your feet on either side, Pop then turn 90 degrees, you don't want to come from one side and turn into it, you will either hop over to the other side, catch your tips, or fall back, you want to keep your weight centered, keep your knees bent. If you want to get off regular then drop your front leg's tail, or if you want to get off switch (looks better) drop your rear leg tail. good luck