Thank you for contacting us, our team is happy to answer any questions you have about working with our products on your website!
You can manage user permissions by selecting the user you want to modify in the All Users list and changing their assigned role using the dropdown.
Database information is directly available through the WordPress dashboard, but there are a number of plugins out there that you might be able to use to locate the data you need.
https://wordpress.org/plugins/search/phpmyadmin/
Please let us know if you have any additional questions, we are always happy to help!