Download and install Parallels Toolbox:
Start Parallels Toolbox. You will see the registration window. You should either sign in to your existing account or create a new one.
After you log in or create an account, you will see the activation window. Click on Try.
Your copy of Parallels Toolbox will be activated for 7 days.
You can purchase the full version at any time during your trial period and reactivate your copy with it. Open Parallels Toolbox and click on Buy to make a purchase, or click on Activate if you have already purchased a license.