At the Print Screen, click on Nudge Printout.

You can use this screen to change the starting position for your sheet. You can tell the program to start printing from a different position on the sheet. In this example, the print will start on the second label of the top row. The shaded label will not print.

Unfortunately, not all printers begin their printing in the same spot and you may find that you will need to tweak your margins. Use the margin adjustments to change the beginning point for the print on each label. Use the label creep adjustment to change the spacing between each row or column of labels. As always, run test prints to make sure your alignment is accurate. Once perfected, you can save your margin adjustments for each label.

Also see:

How do I Adjust the Margins?