To print the expiration date on your product labels, you must first activate the feature on the Print page in Settings.
Click on your Account Name > Settings in the upper-right corner of the screen, in the InventoryLab menu (just below the Threecolts menu if you have that open).
Select Printing in the menu on the far left.
Scroll to the bottom of the page and you will see the Include Expiration Date option. Click the toggle to the right of this option to turn it on or off.
Once activated, your expiration dates will appear on your labels!