All sewing machines thread pretty much the same way. Ask a friend who sews to show you.

Lift the machine itself out of the table. Look on the lower front for a metal plate with a model number. Then go to and under “SEWING MACHINE MANUALS and Related items”, look for your model. It should be “starts with Kenmore”. You can order a manual from there.
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If you don’t want to spend the money, here is the basic idea of threading a machine. Place the thread on the little pole on top of the machine. Thread it through any loops nearby, back to front (usually two slots or loops). Then take it through the tensioner (usually a dial of some sort that squishes two metal plates together). Make sure the thread goes *between* the plates. Then take it up to the “goose” which is the arm that sticks out and goes up and down when the machine goes. It is usually on the upper left of the machine, above the needle. From there, thread it through any “pigtails” (curly metal loops) on the way to the needle. And then through the needle.

The bobbin is below the needle, inside the machine. This will need to be removed, loaded with thread, and reinserted. Or you can buy ready-filled bobbins. But that is another question…

Hint: adjust the tension if the stitches don’t seem right at first. This usually fixes the problem!

Sounds like a great deal! Good luck.