Via the Liquid Web dashboard, navigate to an active plan. Click on the plan name and that should show you the available sites on the plan.
Click the name of the temp domain provided:
The system will notify you of all domains that can be activated.
This will take you to the sites "access" page. From there, click on Domain Options in the navigation pane.
This page will give you an option to modify the domain they issued your account.
You will use the Modify Master Domain option to point traffic to your new server.
In this example, I use networktesting.net. I type it into the input box, and click Change Domain.
Note: Once you tell the server you want to use a new domain, you can't forget to update the SSL certificate, but you do this after pointing the traffic to the server via your Authoritative DNS.
This is what ensures you have HTTPS and prevent warnings like this in your browser:
Navigate to the NOC Auth DNS page.
Select the domain you're working with.
Click edit next to the two main records:
Update the Address for each with the IP address provided by Liquid Web here:
In the Liquid Web dashboard, click on the SSL menu option:
This page is telling you that your server is currently supporting an SSL certificate for the temp domain you were issued. That's why you're getting the error above.
To solve this, you have to enable SSL for the domain you're pointing to the new server.
Before clicking enable, you need to select the domain[s] you want to issue a certificate for.
Click Issue Certificate in the Auto Lets Encrypt Certificate card.