Chat:sendChat(content, targetuin) 

Where:

• content string (The message that the player will send)
• targetuin number (The Uid of the player that will send the message)

And returns:

• ErrorCode.Ok (0 if execution was succesful and 1001 if the execution failed)

When the player presses the “Q” key, He will send a message.

ScriptSupportEvent:registerEvent([=[Player.InputKeyDown]=], function(e) 
 
    local playerid = e['eventobjid']
    local curKey = e['vkey']
 
    if curKey == "Q" then 
        Chat:sendChat("Unlimited power!!!", playerid)
    end
end)