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Navigate to the Module Manager and either press the "New" button on the toolbar or click on a Module Name.
This is where you create new Modules or edit existing Modules. This screen has two links in the upper left: Site and Administrator. The Site link is selected by default. The Site link allows you to work with Modules that will be visible on your web site's front end. This is where you will do most of your work with Modules.
The Administrator link allows you to work with Modules that show on your web site's back end. In many cases, it is not necessary to modify the back-end Modules for Joomla!. All of the standard Joomla! administrator functions are available with no modifications here. You only need to make changes here if you want to change the standard administrator functions.
When you create a new Module, you will select the Module Type. This will determine what type of content this Module can display. If you edit and existing Module, the Module Type will already be determined. Note that you cannot change the Module Type of an existing Module.
Note that if you install one or more Joomla! Extensions, these Extensions may add new Module Types. In this case, your screen will show additional Types.