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yes i have already installed SMF

Well, what i mean is once i'm in the admin section i go to installers (top menu) but do i select components, modules, or mambots? What does each mean? Right now the extension i want to install is the joomla-SMF (forum) bridge. But knowing what each means would be great!

How do i instal an extensiion? This may not be the place to ask but couldn't find anywhere else.

Thanks!