Setting power level of players or factions while in-game is not currently possible. /f kick [player name] works on anyone if you have the factions.disband permission (as covered in the user guide). Most likely, you messed with "chatTagFormat" in conf.json and it no longer has "%s" in it (missing the "s"). EDIT: by the way, I just got through updating the user guide to cover all of the changes and new features available. It should pretty much be up to date. Everyone: please read it before asking random questions which are most likely answered in it.