How do I print an envelope using an HP C3180 printer and my Mac?
Without knowing the software you have on you Mac if i would recommend just using a template from Microsoft Word. With Word open select from the File menu Project Gallery. Then search for "envelope". Select a template to use and make the necessary edits to give it the look you want. When your ready to print load an envelope label side down into the tray on your printer. Make sure it is against the right side of the tray with the width adjuster touching placed so it keeps in in alignment. There are pictures on the tray to help you get it placed correctly. Then print the envelope like any other document.