thought I had a manual with an image of this but can't find it.
But pretty simple.
Place thread onto one of the spool pins at the back right, and pull thread across to the left and around the white blob on top of the machine head then back to the right to the little thread eyelet, down through this and down to the thread guide taking thread around it from the right and back up on the left side, back up and through the thread take up lever, then down again catching behidn the little thread guide, then to needle bar thread guide, then to needle eye.
ALWAYS HOLD THE two threads firmly behind the pressure foot when you start sewing - Really important.
Always wind and insert the bobbin with the holes on top, smooth side downwards. Place bobbin into bobbin holder and take thread take towards you and into the tension spring groove, pressing down on the thread with your finger until you hear it click into the tension spring. pull back the other way to check it is in there, if it comes out, do it again.
Bobbin will rotate anticlockwise when you pull the thread.
THen put needle plate cover down and draw bottom thread to the top using flywheel or the needle up/down button on these lovely machines.
Hope this helps, if not post again and I'll dig out images from my SU manual.