1) Buy the label and click the “Print Label” button 2) At the top of the popup, select the 4x6" label format. 3) You'll see a label preview if you're using a web browser that supports it, like Chrome. In Chrome, put your mouse over the label preview and click the little printer icon on the top right.

Select Print, or New Document to edit, save and print later. If you need just one label, select Single label from the Mailings > Labels menu and the position on the label sheet where you want it to appear. Select OK, the destination, and Save.

The specifications appear to say that the main input tray can handle 4X6 inch paper. Remove the larger paper, place six to seven sheets of label paper in the tray, adjust the side bars to hold the paper in the middle of the tray. Place the little label sheets face down (print side down) with the top of the sheets toward the back of the printer.