Verifying your license key for User Registration addons allows you to have access to automatic updates right on your dashboard. Here is how you can verify your license key.
Go to your account page and click on License key tab.
Copy the license key.
If you have any of the user registration premium addon installed and activated. You will see the license key being asked just below the User Registration plugin installation section as shown below.
Paste your license key on the License field and hit Enter
Your license key is saved and activated.
You can confirm this by visiting your account page ->License Keys ->Manage Sites. Your activated site URL will be listed there.