Before you print tags with Laser Shellstock Tags, you will need to designate a tag printer and set up the driver to print them properly.  To do this, start Laser Shellstock Tags and click the Setup button in the Configuration section in the lower right of the main screen.  In the Setup screen that opens, click the 'Tag Printer' button,  located at the bottom in the center.  Select the printer you will use to print tags in the popup window, then click Okay.  Click 'OK' at the bottom of the Setup screen, and print test tags on regular paper.

You might need to repeat this step if you change printers or printer drivers.

Place your sheet of test tags over a sheet of your tag stock, and hold up to window or even light source so you can see if the data fields are printing in the right spaces.  If they're not, go into your printer driver's properties or preferences, and make sure that the paper size is set to 'Letter', the orientation is set to 'Portrait', and there is no 'Zoom', 'Fit to Page', or any margins set in the driver.  The tags need to print at 100% of the page size.