Upon first run of Radar Toolbox, it will prompt you for your product key. On the main menu, press the Product Activation button to open the Product Activation window.
Figure 1: Radar Toolbox Main Menu - Product Activation button
Using the information from the email no-reply@mods-for-grx.com enter your email address and product key. Then press validate, if your key is valid you can then activate your license by pressing activate.
Figure 2: Product Activation window
Once successfully activated Radar Toolbox will be active.