allow player to edit npc's

i looked and could not find information for it. i know editnpc is a command. i want to allow a player in a group to editnpc's. as admin i can do it just fine but when i place the editnpc command in the groups permissions it says "WARNING: Permission command.editnpc not found!" i also notice it is not listed as a permissions command. is this function only allowed by admin's?

ok thank you for the reply. i wasnt sure what i was doing wrong. makes sense now tho