Hello,
As soon as you have installed the theme, you will get the option to activate the license key. Navigate to Dashboard -> WoodMart -> Theme License, insert the purchase code and check agreement for the storing of the purchase code and user data by xtemos.com
Here are more detailed instructions: https://xtemos.com/docs/woodmart/update-theme-2/
Also, read and use these instructions https://xtemos.com/docs/woodmart/installation-process/
If you have any questions please feel free to contact us.
Best Regards