This stage starts as a long platform with an arrow on it, which then points to a downward slope. At the bottom of the slope is a bump, which allows for a jump. The goal is on the other side.
Roll your monkey to where the arrow is indicating where to go next. Then, go down the ramp, leading you to the platform of the goal. Be careful with your timing and speed. Going too fast or too slowly can cause your monkey to fall out.