License tab is where to add your plugin license key to renew or activate it.

• Current. Determine type of your app is free or licensed for example.
• License Key. If your app is licensed, through this field you can active or renew your plugin.

Just write your license key in "License Key" field and click on "Renew/Activate license" button to activate your license.

You can purchase license key from joudiSoft Click Here

IF WordPress General Application Plugin is licensed mean Remove / Replace Ads, No backlinks and Unlimited Notifications.