PrefixGui makes it easy to manage and create prefixes.

Commands
/prefixgui - Opens the prefix selection gui
/prefixgui create <minecraft:item> <prefix> - Create prefix
/prefixgui remove <prefix> - Remove prefix

Permissions
prefixgui.create - Can create prefixes
prefixgui.remove - Can remove prefixes

PrefixGui uses permissions for players to gain access to each prefix.
For example: prefixgui.prefix.&a[Silver Rank]&r will give the player access to use the [Silver Rank] prefix (Note: only if you have created it first).

Gui
The simple gui makes it easy for players to select and change there prefix.

Config
All messages can be edited in the config!

Tutorial