Apr 28, 2021 · Apr 28, 2021 · To use an iron, start by setting up an ironing board near an electrical outlet. If your iron has a steam function, fill the reservoir with water, then plug in the iron so it can heat up. Next, turn the heat dial to the most appropriate setting for your fabric—if you aren't sure, check the garment's care tag! Then, lay the garment out perfectly flat on the ironing board.