1. Register a new account on No-IP. During the account registration select a subdomain address - you can use this address as your router address. For example: i3pro.hopto.org
2. Confirm account registration (a confirmation code will come on e-mail). You will get access to manage the domains in the "Managed DNS" field.
3. The subdomain registered during the creation of account is already active. Subdomain name is needed for setting the router