When using a presser foot that has a wire guide (holes for the wire to fit through), I find it easier to put the wire in the foot before I attach the foot to the serger. You will need to set the serger for a rolled hem. The guides in the foot should guide the wire to the right of the needle allowing the rolled edge to be created over the wire. Use a decorative thread in the upper looper to ensure that the stitches completely cover the wire. Have fun!