1: Preheat iron to cotton setting;
2: Pretest your fabric for heat tolerance at this setting;
3: Place the patch on the surface of the cloth or curtain, Cover the patch with a cotton cloth. Iron for 10-15 seconds, tacking it into position.
4: Turn garment inside-out and, with your heat iron, apply pressure for 20-25 seconds to the back of where your patch has been tacked.
5: If you want the patch more secure, Sew along the side of the patch.