Slide the pant leg with the patch over the arm of the sewing machine.

You may need to remove the sewing machine table for the pant to fit over the sewing machine.

If you are still having trouble getting the pant around the arm of the sewing machine, you can rip the side seam of the pant leg to allow room to sew.

Be sure that the pant leg is around the arm, and that you are not accidentally sewing the two layers of the pant leg together.