I just bought the same machine and mine came with a photocopied manual. There is indeed a bobbin winder on the side, there's a flat section on the side of the bobbin winder closest to you, if you push that forward it connects a wheel attached to a bobbin spoke, to the belt that runs between the machine and the motor. To wind the bobbin, put the bobbin on sideways onto the axis of the wheel that is on the inside of the machine, and push the bobbin winder forward.
If you're looking for where the bobbin case is located on the machine, if you look underneath the machine on the left hand side, there should be a metal belly, on the left side of the belly is an opening, and in there sits the bobbin casing.
I think you were asking for either one of these answers, I'm on here troubleshooting for my Juki DDL-8500, good luck with yours, hopefully I can find what I need to know too!
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