Under the "Mailings" tab in Microsoft Word, select "envelopes". Type your desired delivery address. Next, under "options" select #10 size envelope (4 1/8 x 9 1/2).
The slot on your home or office printer with the adjustable width? That's designed for printing envelopes. And it's no coincidence that the Friend Paper LabelEZ® is the exact size of a standard #10.
With your address added & your label loaded, there is nothing left to do but press print. You now have a Post Office compliant label ready to adhere to any envelope at any time.