Are you already hard? Keep stroking.
When I tell you to edge I will also tell you to hold the edge afterward. This means staying as close to the edge as you can.
You should maintain hand contact with your penis and keep stroking even if it is an incredibly slow stroke. Even if you are just brushing your hand very slowly and gently over your shaft. If you must take your hand away then quickly and briefly do but don't let the edge dissipate. Keep riding it until you are told to stop.
Try not to clench your PC muscle unless instructed (It's okay if you do, just try not to).
If you find holding the edge too difficult then stroke slower and with less of your hand in contact with your penis.