You dont really need to "break in" a piston ring. I would first just start it and let it warm up, then just ride it kinda easy for the first ride or two. Im sure this isnt what you wanted to hear, but I'll explain. (Or try to anyway):)
The reason for "breaking a bike in" is when you put a new top end in it, (new piston, rings, gaskets) the piston is brand new. And a new piston will heat faster than a broken in piston. And everyone knows when something heats up, it expands. So a broken in top end will heat equally. But with a new piston and a broken in cylinder, the piston will expand quicker than the cylinder causing seizure. Correct me if Im wrong, but the ring really doesnt have a factor in the seizure, so it shouldnt really matter if its broken in or not.
I hope this helps you a little.