When you're running a WordPress multisite installation, there's another user "level" that's not there on a normal, single site WordPress installation. This user is often referred to as the Super Administrator. The Super Admin is the user that you create when you first installed WordPress.
The Super Admin is the user who creates all the individual blogs and sites, administers theme availability for those individual sites, and is generally responsible for the health of the entire blog or site network. The Super Admin has many more right than typical users, even the administrator users for individual blogs or sites.
When you first login as the Super Admin, you'll see the WordPress