OK here is how to thread this and 16 zillion other similar machines:
[ATTACH=CONFIG]458072[/ATTACH]
To thread this machine, first raise the presser foot, then take the thread from the thread spool (1) to the rear thread guide (2), through the rear guide to the front thread guide (3). Through the front guide and down and under the top tension (4) from the right to the left. Make sure the thread is fully seated between the tension disks.
From the top tension the thread goes up and passes through the guide (5) then up to the thread take up lever, through the eye on the lever from right to left. Then down through the guides (5 and 7). Then down to the needle bar and through any guides on it. Then through the needle. How you thread the needle depends on how the needle mounts in the bar. Most likely it will be front to rear.
Very simple. Hope this helps.
Joe