I admittedly have never used OSMAnd's editing plugin, so I'm afraid I am not much help here, other than pointing to the documentation:
https://osmand.net/docs/user/plugins/osm-editing/#overview

If you plan to edit on mobile, there are a few other options which you might find easier to use:
https://wiki.openstreetmap.org/wiki/Editors#Mobile
I personally use StreetComplete (Android only) and EveryDoor (Android and iOS) and found them quite easy to pick up and learn.