How to Install Plug-ins In InDesign
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To install the plug-in, locate the Adobe InDesign program on your computer and drag and drop the script file into the Adobe InDesign CS2 > Plug-ins folder. You can also put the plug-in inside a folder inside the plug-ins folder if you like (for example, David has a folder called “Third-Party Plugins” that he uses as an aid to organization.
Note that you may need to have an admin account on your computer in order to add plug-ins and scripts to InDesign … but once they’re in there, they’ll work for all user accounts.
Plug-ins only get activated upon launch, so if InDesign is currently running you should quit and relaunch it. Most plug-ins come with ReadMe files explaining how they work.