In Windows / MacOS you can enter your key on the login page when starting the program.
You also can go to user menu, then log out and enter your license key in this page.
In iPhone application you can buy your license using in-app purchases in plans page
Or you can activate your license using key:
1. On bottom right of mobile app please click “profile” icon
2. Click “Activate License”
3. Enter your license key
