1: Put the PATCH on the place you want, and preheat the iron(120-150°C). You can put cotton fabric on the patch to secure the cloth before ironing. 2, From 2 sides of cloth ,respectively iron 30-60 seconds with pressure to ensure that the adhesive melts and fix well. 3: Finally, iron from the front for 1-2 minutes, the main position are edges and corners, to ensure the smooth surface,if you want them better,it is best to sew the four conors. More details: Search "how to iron on patch" by GOOGLE