Keep your address up-to-date with BSIS.
BSIS will send a guard card renewal application to the address they have on file for you approximately 60 days prior to the expiration of your guard card.
If you’ve recently moved, you can download a change-of-address form here:
Note: If you renew your guard card and update your address online at the same time, there’s a chance that the automated licensing system will mail your renewal to your old address. So be sure to file any change of address with BSIS as soon as possible before renewal.