Help! PFAFF 1196 only sewing backwards Sewing Machines Parts and Sales in Los Angeles

I have a PFAFF 1196 that seems to be having some issues..

I am a beginner with sewing, and I recently re threaded by bobbin and when I put everything back together my machine will now only switch backwards.
When I go to make a forward stitch it just keeps stitching in one spot and the fabric is not propelled forward.

Is this something I may be able to fix myself or should I take it in to get looked at?
Thanks!