There is a methodical approach to encoder on GPIO pins, and it is unlikely you will hit a working configuration initially, as not only do you have the mechanical issues of connecting to the GPIO pins but there is the configuration in webconf to be complete.
Get the Select switch working and then progress methodically from there.
Personally I don’t recommend doing it for various reasons. Clicks appears on the audio output for example and the configuration can change unilaterally from Pi themselves.
A preferred way is to use the 23017 chip , which is outlined here…