I can't see this manual available at the usual spots of:
but you could email either of the first two websites and ask them.
If you look at the threading up diagram here,
it may be sufficient info to get your machine running.
I'm presuming it is a front loading bobbin and case model? Many models are this style Singer, Jones/Brother, Toyota, Bernina, once you've mastered the bobbin case and bobbin, they are all very similar.
If it is a top loading bobbin style then look at the threading up diagrams for the Janomes, it may be more like them. These there is no removable case, you load the bobbin into the bobbin holder and click the thread into the tension spring.
The critical thing for threading up all sewing machines, is winding the bobbin nice and smoothly, getting it into the bobbin holder or case the right way and placing the thread tail into the tension spring correctly so the thread is under tension as it feeds out.
And for the top thread, it must go through the take up lever, tension dial (usually two metal discs that press together with a spring) and then down through the needle eye.
Always, thread up the top thread with the pressure foot up - this opens up the tension device.
Hope this helps out a little at least.