yoda

I know this has probably been asked a lot..but I'm just not a very smart person when it comes to installing things...There are a lot of plugins I'd really like to use, but I don't know quite how to go about doing that. Is there a certain folder you have to save them in? Please try to be thourough...I'm not very good at catching things sometimes. Thanks for your help! And may the Force be with you; -Yoda