When printing mailing labels from the system, you will need Avery 5160 labels.
A common issue with printing from the system is that the labels do not line up correctly.
When printing from Adobe Reader using a Windows computer, make sure that the 'Auto-Rotate and Center' box is unchecked. Also, make sure that the Page Scaling drop-down is set to 'None'. If your version of Adobe is not displaying those options, there may be one called Page Sizing & Handling that should be set to 'Actual Size'. Page Scaling should be set to Fit.
Screenshot of a PC printing from Adobe Acrobat
Screenshot of a Mac printing from Preview