adding a new domain to my account

I find this really really frustrating and unreasonably hard to do.

Ive installed a new MU WP site and installed the WPMUDev Dashboard plugin.

I cant see anywhere or any way to register this new site/domain with my WPMUDev account.

Previous support question was answered with:

1. go ->

but there is nothing there to suggest adding a new domain.

2. install WPMU Dev dashboard and login to the dashboard.

but there is no login other that the site’s login.

Can you show via an illustration or a specific detailed description, exactly what the steps are and what the exact locations of each click i need to take in this process of adding a new domain please.

This will likely enable me to have a good day.

Thank you