Like older MOS versions the new 4.5 uses buttons to make content page based decessions. The new version comes with a completely new button set which also comes without subtitles. To make things a little easier for you, this is the complete list:

In the 'Site' menu you can choose the menu point 'Configuration' to access the global overall settings for your new Mambo Open Source website. Change them on one of the following four screens:

After you sucessfully installed MOS 4.5 on your webserver you can go on to the new admin interface. This article with give you a brief overview on the new menus: