The site name is displayed at the top of the screen. The site manager has additional options under the tools menu and an additional invite button to set up and manage the site and it's members.
Sites are made up of different features, or pages, which you can find under the More menu. Each new site includes only a library, but a site manager can customize the site to include any combination of pages, including a wiki, a blog, a calendar, a discussion forum, web links, and data lists.
There's a Site Members link for managing the site membership.
A site manager can resize most dashlets by clicking and dragging on the bottom edge of the dashlet until it's the height you want. This is saved between Alfresco sessions.