A website built with RVsitebuilder 7 can be managed by user without asking hosting provider for help. All contents are stored in database (the one that was automatically created when you created site), you can find it at.
1. Go to cPanel -> File Manager -> /home/<user>/ -> rvsitebuildercms -> Domain Name folder -> .env
2. Go to cPanel -> phpMyadmin.
At the database you got from number 1, table "core_page.