In order to activate your license, start AD Unlocker Pro, click on the "?" menu and then click on the "License" button.
The following window will be displayed:
Enter your license key in the focused text field, then click on the "Check" button.
If your licene key is valid, the window will now be looking like the once displayed below, to confirm that you have indeed an activated license:
Thank you for choosing AD Unlocker Pro!