You will solve this, just be very slow, careful, baby steps. and don't pry or force -anything-.
You can call it a handwheel. It is not moving, very likely as was pointed out, because of a thread jam near the bobbin.
The FWs are wonderful! But. notoriously easy for getting thread jams, espe if the needle is on backwards, which often happens, as it is counter-intuitave to many.
Go slowy and cautiously with your exploration of the bobbin area, take lots of photographs, and be patient - stop and post a question any time you have any reservations. We're all here to help, and you will solve this, yes you will. :-)