You place your strip right side up, start placing the squares on top of strip right side down, leaving just a little gap between squares & just sew down the side of the strip/ squares. Then you can either press while joined or cut apart between squares. If you are adding another strip press the squares out away from the first strip, then turn it over & place the squares onto the next strip, right sides together & sew. Then you can press again & cut between the squares