To redeem your Kaspersky Anti-Virus 1 Device (1 Year) gift card, you can follow the instructions provided by Kaspersky 1. Here are the steps:

Download and install Kaspersky Anti-Virus from the Kaspersky website.
Once Kaspersky Anti-Virus is installed, open it.
Click on the Activate button.
Enter your activation code in the Product Key field.
Click on the Activate button.