After you download a plug-in, read the Read Me that comes with it for important information. Afterwards, simply drag the plug-in into your Plug-ins folder in the Escape Velocity folder. When you launch EV, the plug-in will be activated. Because of the possibility of multiple plug-ins conflicting, it is recommended that you only use one plug-in at a time. If you do wish to use more than one plug-in at a time, it is recommended to downloaded a copy of the EV Plug-in Auditor to check for conflicts.