I recommend switching to groupmanager as it is a whole lot easier to use for permissions. You can get someone to do permissions for you but I'd recommend you look up a tutorial on how to add permissions and I'll link you a few permissions.
For your admin rank you can add the permission node '*', a star means every permission is given. If you want to give Knight ALL essentials permissions (this includes cheats such as /god /heal /tp /kill /kick /ban etc.) you can give them "essentials.*" anypluginname.* gives them all permissions for that plugin. If you would like to add some essentials permissions I would recommend going to http://wiki.ess3.net/wiki/Command_Reference/Perm (list of essentials permissions) and using the nodes found there.