There is no bobbin "case" like you'd find with a featherweight or model 15... that long piece that lifts is what you slide the bobbin over and then push it in to clip the bobbin in.
I don't have a manual to copy for you, I just "wing it" when I thread the machine, and so far, it works!
Let me know if you need a photo...or maybe someone here has a manual they can scan for us?