How activate textboxes without clicking on them? (Sloved! :)

Hi i tried to make a custom chat and i don't know any way to active a textbox without clicking on them

Here is what i tried

uis.InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.Z or input.KeyCode == Enum.KeyCode.Y then -- Made that because i'm a austria german and have a qwertz keyboard
        chatgui.TextBox.Active = not chatgui.TextBox.Active

    end
end)

That didn't work so could anyone help me?