How do you make a certain player when chatted, he teleports?

This is a basic answer, All of the below was modified from the roblox wiki which I linked to you earlier.

local Admins = {
    ["Player"] = true;
    ["Player1"] = true;
    ["The_Voids"] = true; ---Add all the admins you want
}

local Spawn = game.Workspace:WaitForChild("SpawnLocation")--Define the spawn location

game.Players.PlayerAdded:connect(function(player)
    if Admins[player.Name] then 
        player.Chatted:connect(function(msg)
            lowerMsg = string.lower(msg)--makes message lowercase. Not needed.
            if lowerMsg == "tp" then ---tp can be whatever. Make sure the letters are lowercase
                player.Character:FindFirstChild("Torso").CFrame = Spawn.CFrame --teleports the player to the Spawn Location
            end
        end)
    end
end

Hope I helped. This has not been tested but should hopefully work. Good Luck

Here, then help, I've tried this. Developers = {"The_Voids", "", ""} function processCommand(speaker, message) -- if someone chatted "tp" if message == "tp" then -- teleport them game.Workspace.Player.Torso.Position = Vector3.new(0, 50, 0) end end