Print on 3M 3700-R labels, or Avery 5195, or the equivalent at your office supply store. Be sure to test it first, and you may need to adjust borders on your printer.
Digital files are to be printed on your printer at home. You’ll be sent a link to download a ZIP file; double-click it to expand it into its elements. You may need to place the jpg or png into another program to use it at cardmaking size – MS Word or something else you have. Please see this tutorial about using digital images.