Assuming that from now on you have introduced Webroot activate safe, you can follow these means to apply a keycode to the current establishment:
For Windows PC:
Open Webroot activate safe and select My Account.
On the Account screen, look at the right side of the screen.
Under the Activatation you will get a new keycode, enter your keycode in the field provided and click Activate.
For Mac:
Click on Webroot in menu.
From the main window, click My Account.
https://www.webrootsafes.com/webroot-activate-safe/
Click Activate a new keycode.
Enter the new passcode and press Activate.