Starting with Unifi
To access your controller, you'll just need to log in to your Illumii account which you can do here.
From the first page you get to (home dashboard), you'll see your server URL. If you click on this it will take you to your Unifi Network Controller where you can get started with signing in, or creating a new account.
We recommend using your UI.com account to sign in so that you can apply Multi Factor configuration (mfa) on your controller.
You can then proceed to adopt devices or restore from another controllers backup.