Hi :
I’d be more than happy to help you out.
To activate your license you will need to download and install The Events Calendar PRO plugin on your website. After you activate the PRO plugin you should see a new “Licenses” tab under the Events > Settings screen of your WordPress Admin. Within this page you can enter your License Key as shown in the below screenshot.
https://cloudup.com/cN1SGz480Q2
Please let me know if this answers your question and thanks for reaching out to us.