I'm just guessing, and hopefully someone that has this machine will give you better advice, but I think it would be something like this:
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Go through thread guide 1, then down around the tensioner 2. Make sure your thread is through the tension wire loop thing 3, then under the metal bit at the bottom of the uptake 4. Go up through the takeup lever 5 (right to left), then back down through the squiggly wire 6. Behind the above-needle guide 7, through the needle (left to right), and you're done! Previous posts have mentioned that the needle goes in with the flat side to the right.
Hopefully someone else can confirm this, or perhaps has an actual diagram.