To register I need Two keys (FSUIPC and WIDE FX)
No you do not. You only need your key for FSUIPC. You only need to register a WideFS key if you have purchased WideFS. Otherwise, just leave it blank.
I don't understand why my FSCUIP in my p3dv4 shows NO control axis and button inputs! WHY?
Because your licensed wasn't registered and you are running an unlicensed version.
Your program confuses the crap out of me with installations.
Why? What exactly is your problem? Did you read the provided installation and Registration document?
To register your license, just enter your details (Name, Email or Address, FSUIPC6 key) and click the Register button.
Please explain what your issue is as I have no idea from your description.
And please not that this topic is for a different issue and is for FSUIPC7, not FSUIPC6. If you cannot register after reading the provided documentation and trying again, please create a new issue explaining your problem.
Getting very frustrated here about to file a complaint with PAYPAL.
Sorry you are having such issues, but I don't understand why. Installation and registration should be straightforward, and documentation is provided (although really shouldn't be needed).