Активация лицензионного ключа наглядно показана в данном видео:
Follow this tutorial:
Copy key code from your e-mail or personal Cabinet on site.
Add key code in License key field in menu Appearance – Theme License and click on Save button
There will be Activate button, if you have successfully saved key – click on it
If you have successfully activated it, you will see information about your license – number of sites and expiration date.
Now wait for notification of new version in Admin Panel in order to get the latest updates!