the World folder is basically your world name. You just click on it and click on the groups.yml (Mac).
That is wrong. I deleted 25565 from server.properties but it does not work. When i opened run.command (Mac), 26635 Respawned.
http://dev.bukkit.org/bukkit-plugins/prisonrankup/ http://dev.bukkit.org/bukkit-plugins/rank-up/ Those are the links. These are good for...
Try downloading the plugin again and delete the old version. You may not change anything in the file or things will go wrong.
Rather than using the default permissions.yml, you need to use a plugin such as PermissionsEx. There is a wiki for it, so just read that. It's...
Separate names with a comma.