There are a bunch of threads on the backroll but i will help.
You wanna cut out about 10-15 ft away from the wake, take a pretty mellow edge back towards the wake. Once you are about 3-4 ft from the wake start to build your edge and create tension on the line. Keep that strong edge all the way through the wake and once you are at the top of the wake, stand tall while holding that edge. Make sure to edge all the way through, wait for the pop, and then look over your lead shoulder. Also, make dang sure you keep the handle in on this trick, literally try and pin your elbows to your sides. The reason you keep the handle in is to help you spin faster, if you let it out too early or dont keep it in at all you will most likely come up short, and hurt yourself. Just remember, this is a load and release invert not a trip flip like a tantrum, so def hold the edge all the way through the wake. If you do it right it should feel like the boat is doing the work. Give it some tries and see how you do. Good luck.