FASTPANEL® is provided absolutely free.
To order a license you need to create your billing account. After registration and logging in your billing account you should do the following:
Order a new license
Add licenses to the cart and fill in the IP address field.
Press the “Checkout” button, afterwards your license will be created automatically.
If your server is behind NAT and doesn't have a public network interface, you will need to activate your license with a key after the panel is installed.