There are videos on YouTube that show you how to set your tension by hand. Just take a picture of your bobbin and screw position before starting so you can turn it back to the original position if needed. Usethe little screw driver to turn the little screw...righty tightly or lefty loosey.....just a tiny bit at a time. Put different coloured thread in the bobbin and top so you can see when you get a balance stitch. Don’t fear changing your bobbin tension yourself.