After a successful purchase with a checkout link, you will receive a notification about this purchase that contains a license key - for example, the key is ABC123456.
Log in with your online user control panel, find the menu Account, you will see menu Renew. Click on that button you will see the link I have a gift code/ license key.
Enter the key and click Apply button.
Your expiration date and package type (such as Gold, Premium, Standard, Trial ...) will be changed.