Doing it for a fort. Don't need a whole admin thing, just a mute command. Ex. :mute p2c2e
(Oh yeah, I have no knowledge of scripting. So, good luck trying to help me :P)
You would have to make a admin with a localscript function, which can be done on script builders or you can take a source from your game. If you have no knowledge how to script, try starting off with variables. http://wiki.roblox.com/index.php/Variables In other words, you could clone this script into a players backpack.
game:GetService("StarterGui"):SetCoreGuiEnabled("Chat", false)
:SetSuperSafeChat(true)
This should work.
And its not possible to mute a player, there will still be the chat bubble if you mute them.