Seems simple enough. 1-8 on the short side, Negative(black wire) to the top.digital datastream port, A2, A1 on the long side respectively from the 8 channels. Antennae on other short side.
The 8R-ii plus is already jumpered to give you input battery voltage to your telemetry rx.
I might add, there's a ton of data on that frsky website BUT some of it is pretty overwhelming if you're not quite sure what you're looking at.
Think you can do that on the 9xR and the 9x as well but I didn't know it was a competition. Or that Futaba was a Merican company. Seems to me thats a Japanese company that's expanded all over the world. But whatever. You stick the servo in the slot that makes it move when you wiggle the sticks, you can't go wrong.