In this interface you will have the option to upgrade the plan/s you are using for your existing domain/s. If you have multiple domains, you will be able to upgrade each one of them separately by choosing the domain you wish to upgrade and the desired package you would like to upgrade to. This option is also available on the dashboard (bottom of the main page).
Additionally, you can add additional domains to be protected by our system by typing in the URL of that domain at the bottom of the page. The new domain will have the status of the free plan (with limited analytics and without automatic IP blocking) until the time you decide to upgrade it.