Right now Akelos only supports mod_svn repository access without SSL like the one available at http://svn.akelos.org/plugins.
These repositories will be listed when typing
./script/plugin discover
In order to install a plugin you just need to type
./script/plugin install plugin_name
or
./script/plugin install http://subversionhost.example.com/plugins/plugin_name
Keep in mind that your plugin repository must contain the plugins text on the URL in order to be accepted by Akelos.
The plugin will be installed at <project>/app/verndor/plugins.
$Model→find_by_user_and_name('John', 'Smith') on your Active Record models.