How to add rotary encoder for switching between radio stations?

[DRONE7]

I'll take a guess that you want to operate a moOde device as a conventional mantle radio...? No screen and no access from other devices...just turn on and select from a favourite list of stations...? Hence your question about a rotary encoder.

If this is the use case then you will find something similar has been done using infra-red remote and /or push-buttons.
Tutorials are in the FAQ and Guides section of the forum.