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This section of the support wiki covers specific addons that can provide more functionality to your site. For an addon to have an effect within your software it must be installed and enabled within the following admin tool:
ADDONS > MANAGE ADDONS
Installing an addon (click the "install" button next to it) runs an installation script for that addon so that all of the components necessary to use that addon are installed to the site. When you click the install button within the above admin tool you will be notified of any compatibility or installation issues installing that addon. Certain versions of addons only work with specific versions of the base code. One of the steps of the installation process is to check those compatabilites.
The next step is to configure and enable that addon for use. Each addon is a bit different in that some addons are completely configured in the addons admin tool, other addons only add configuration switches in other parts of the base software admin tool, other addons just add functionality by being turned on (nothing to configure) and still others provide a mix of configurations within the ADDONS admin tool section as well as within places of the base software admin tool.