- Lay the base item on a flat, heat-resistant surface. An ironing board is useful, but if you don't have one, you may also lay your item across a doubled-up bath towel on a sturdy table.

Heat up an iron. Turn it to the hottest setting your fabric can tolerate. Make sure the "steam" option is turned off, and that your iron isn't full of water.

Place the patch in the position you chose. The adhesive side should be flat against the base fabric. Make sure that the patch isn't crooked. On embroidered patches, the adhesive side is the underside

Place a thin towel over the patches to Protect it from the heat and also the surrounding fabric.

Position the heated iron over the patch and press down for about 15 seconds. Apply as much pressure as you can by pressing down firmly.

Lift the towel and check to see whether the patch is fixed on securely by gently rubbing at the edge with a finger, trying to lift it. If it lifts up a bit, replace the towel and press it with the iron again for 10 seconds.

Consider sewing around the edges. For a completely secure patch, use a sewing machine or a needle and thread to secure the patch to the fabric. This greatly reduces the chances that the patch will fall off.