If your domain name is registered on a server that is already using RVSitebuilder, and it's cPanel license, you can create a site via RVsitebuilder 7 on your cPanel control panel. Websites created this way, will have a database name already assigned for you.

If you'd like to use an existing database name, you can install it using the web-installer, following this guide: https://rvsitebuilder.com/installation/rvsitebuilder-control-panel/

This way you can adding the current database you want to use with the website.