When your back trucks touch the edge, put your front trucks on the edge / coping too. This will feel a little like a 50-50 grind, except totally different!
Keep your torso vertical the whole time, unless you are pool riding - for you guys, you want to stay perpendicular to your skateboard. For for most skaters out there just riding on ramps, keep your body vertical. You will be in a precarious position, perched on the edge, defying gravity. This should only last a moment, then gravity will start pulling you down. Use that pull, do another half kickturn down the ramp, and ride straight down it.
