Getting an expression pedal to work with a Yamaha YDP-143 digital piano
So like quite a few people, I have been stumped by the "CC11 not received" message, which I did not see coming because who reads the manual? I looked online and found I need an expression pedal, so I bought the Nektar NX-P expression pedal, along with a 6.35mm to 3.5mm Jack adapter and then a 3.5mm Jack to USB adapter. After all that, the pedal doesn't work and I can't find any information on how to connect one to a digital piano instead of a MIDI keyboard.
It seems the YDP-143 only has Jack sockets for headphones, in which case I've answered my own question, but I also don't know if I need to connect the pedal to the piano or computer if I want to play from the computer on Kontakt.
Sorry if this comes off as a bit rude. I'm feeling a bit stressed right now. Anyway, any information would be appreciated.