Users
Admin Panel > Manage Users > All Users
Anyone registered for your site is listed in “All Users” icon under “Manage Users.”
You can divide users into four categories:
Administrators –
The admin can edit and configure all aspects of the website. The website creator starts out as the only admin, but can later designate others to share this role.
Contributors –
Contributors start out with privileges to post blogs, but not edit or configure the site. Admins can give contributors more privileges, such as creating image galleries, on the Features/Permissions page.
Registered Users –
Anyone who signs up for your website is a registered user. They start out with privileges to leave comments and vote with star ratings. You can give them more or fewer privileges on the Features/permission page.
Unregistered Visitors –
These are anonymous visitors to your site. They don’t have a profile. You can give them read-only privileges, or you can give them more or fewer privileges on the Features/permission page.
Remember, you can decide what power each role has on your website with great precision by going to Site Settings > Features/Permissions. Every feature on your site, from commenting, to five star ratings, can be made assigned a different permission.
How to assign someone a role:

Check the box next to the user name, then from the “Operations” drop down, choose “Modify User Role” and then click on “Execute.” A screen will appear that prompts you to choose between Administrator or Contributor.