Just follow the instructions. I'm sure you can find lots of information about it on RCU and on Youtube. It's best to try it out on one of your junkers first to get use to how it works. You can always switch it off if you don't like what it's doing. I don't like flying it in 2D mode because it tries to level the wings and fights you on turns. 3D works great.
One drawback when using it on larger planes is that it can support only one elevator output and one rudder output. It will support two aileron servos, flaperons and do elevon mixing. If you have dual elevator servos you'd have to Y them together (and use one reversed servo). Also if using it with high capacity servos you need to Y in additional battery power. That's covered in the instructions.
Joe