how to work the bobbin on model 626 and any picture to show how it worh?

If I am right you are talking about a Singer self win d bobbin.
Thread the top of the machine up as normal and make sure the presser foot is up, open the slide plate, push the white button over to raide the winder, take the thread from the needle and wind it round the presser foot screw a few times, put the machine on straight stitch, press on the foot control slowly and the bobbin will wind, when the bobbin full, close the slide plate to drop the windere down, take the thread and pull it to the back of the machine and start sewing.
ken

ken
January 2011