Making the horn work is easy. Just re-attach the wires using connectors from the horn button to the wires connected to your horn before. I hooked mine up when I originally installed my car, then detached the horn 2 days later and havent used it since.

As for the signal problem, I have the same issue with my left signal. My right signal turns off normally but I have to manually turn off the left one. I dont mind so much tho. I got used to it quickly. I use the MOMO hub also.