Do not use an ironing board and do not use steam! Use a table or counter top with a hard surface.
Set the iron on the cotton/linen setting. Allow time for the iron to get hot.
Place a terry cloth towel on the table or counter top. Place the garment on the towel.
Position the patch on the garment.
Cover the patch with a pressing cloth or a Teflon ironing sheet.
Making sure the iron is hot, place the iron on the pressing cloth and patch using very firm pressure. Do not move the iron.
Hold the pressure for 30 to 35 seconds. (40 to 45 seconds for heavy fabrics such as denim). The goal is to melt the adhesive on the back of the patch into the fabric of the garment.
Pick the iron up and repeat the process for any unheated areas.
Allow the patch and the garment to cool. Turn the garment inside out and repeat the process.
Do not attempt to iron the patch on garments that cannot accept the highest heat setting on an iron. For example: leather, silk or nylon.