Add an edit button in the kit menu, on the individual kit redeem page, for players/admins with permission.

Type /kit (kit GUI Opens)
click on kit PvP(kit PvP opens)
Click Edit (Opens same GUI as /kit edit PvP)

Or you could simply type /kit edit <kitname> and that kit would come up in the GUI to edit , Bearing in mind that in some cases if you are changing kit description "bound" keys might be activated, (i edit that in data)

Thank you. I am aware of the /kit edit <kitname> command. The author appears to be moving functionality away from the typed commends and into the GUI. When you are trying to shape the look of kits, available for your players, and are already in the main GUI; It would make since to keep the functionality in the same location vs closing the main /kits GUI and typing in a new command. My suggestions are geared to making the pugin more intuitive.