somewhere on the cover the labels came in, they should list what software you can use to print these on...and usually you can get that software free online via Avery.com or whoever they use for their template Most likely it will be Avery.

The labeling software that I use has a calibration function. Basically, you print the labels (on regular 8.5x11 so that you're not wasting your real labels), then you make adjustments in the software based on where the printing actually turned out on the page.

Place the 8.5x11 page overtop your label page, hold it up toward a light if you need to, and see how the print on the top page lines up with the labels on the bottom page, then adjust the calibration. Repeat until your labels print in the right place, then print them on the label page.