If your machine has a variety of stitches with pictures, there is are usually two you can use depending if the fabric is a fine knit or a double jersey. If fine knit use a zigzag with a narrow sitting on the width, and a slightly larger on the length, if a sturdier knit mist machines have a stitch that looks like 3 straight stitches width wise, that is the one to use. I don't have a Bernina so can't tell you the stitch number on your machine.