Allows you to mute players using /mute PLAYER
You can unmute a player using the same Command again ( /mute PLAYER)

You can see all muted Players using /seemutes . This Command allows you to open a Inventory, that lists you every muted Player.If you click on a PlayerHead, you will unmute this Player.Its easy to use.

You can use the /mute Command and the /seemutes Command only as a Operator (OP).

--Have Fun