Try this:
local Players = game:GetService('Players')
local ChatService = require(game:GetService('ServerScriptService'):WaitForChild('ChatServiceRunner'):WaitForChild('ChatService'))
Players.PlayerAdded:connect(function(player)
local speaker
while not speaker do
speaker = ChatService:GetSpeaker(player.Name)
wait()
end
if player.Name == "Rezault" then
speaker:SetExtraData("Tags", {{ TagText = "OWNER", TagColor = Color3.fromRGB(4, 175, 236) }})
speaker:SetExtraData("NameColor", Color3.fromRGB(85, 170, 0))
speaker:SetExtraData("ChatColor", Color3.fromRGB(239, 184, 56))
end
end)
Change the if player.Name == “Rezault” to whatever you wish, and make it whatever tag and colour you want.