converting Forge "default" site to actual site

I have a site hosted on Forge that is labeled as "default". I know I was supposed to create a new site before publishing, but I didn't. This default site basically works and I don't want to mess with it. All I wanna do is change the domain. It says not to change the domain from default to something else, and when I tried it it messed up my site. So I changed it back to default.

But when I created a new site, it just created a new blank site... I'd like my new site to be just a copy of default with all the data that is in there too, like all the user accounts and database stuff as well. How do I do that?