If you have a manual with your machine look at it to see if it has directions for how to wind the bobbin. If not, find a friend with a Singer machine and ask for help. I hope you are not running the thread through the tension disks as that is not going to work, nor is changing the tension. That is for sewing only. Sounds like you need a real person with some sewing experience to take a look at it and see what is wrong.