Now that the two are pinned together, you simply baste them together. This doesn't have to be perfect (although I usually try) because all this basting will be removed later. The purpose is to give a nice secure edge that we will then be able to whip stitch together. Start on one side, fold the fabric down, fold nice corners and go all the way around the hexagon. Now you have a bunch of little fabric hexagons, cute aren't they?