JPEd find it's plugins by scanning various locations: The java classpath (useful if you want to include plugins with a custom distribution of JPEd), the JPEd installation directory's plugins folder and from the user JPEd configuration folder. This all makes it very easy to install plugins, using simple drag and drop.
To install a plugin in the JPEd installation directory, go to the JPEd installation directory. You should find there a bin/ , a lib/ and, eventually, a plugins directory. If this last one does not exist, create it. Simply put the plugin jar you downloaded inside that directory.
To install the plugin inside the user home directory, you have first to locate that directory. Under that directory, there should be a .jped directory if you already launched once JPEd with that user account. Create a plugins directory inside that .jped directory. To make it simple, with a windows default installation, it's c:\Documents and Settings\<username>\.jped\plugins and under unix operating systems it's $HOME/.jped/plugins . Just drop the jar of the plugin inside that directory.
To get specific informations about where JPEd find it's plugins, go to help -> about -> plugins in JPEd.
