I dont know how to thread this serger. i dont

Have you opened the front of the serger to see if there is a threading guide.

Basically:

Lift the thread antenna to it's highest position.

Lift the presser foot and set the tensions to zero.

Turn the handwheel so the loopers are at their highest point.

Begin with the upper looper (first thread cone on the right/ end of looper is pointing toward the presser foot). .

Second spool is for the lower looper (end of looper is pointing away from the presser foot).

Third spool, right needle; fourth spool, left needle.

Be careful that the threads do not cross during the threading of the loopers.Follow all the guides, taking the thread under the presser foot and to the left side of the serger.

Set the tensions back to 3 - 6 and lower the presser foot. Sew a few inches and if the threads knit into a chain, you can then do a test sew with fabric.

Simplicity's Simply The Best Sewing Book has good information with regard to using a serger that you may find beneficial.