How can I Add/Remove Health from a player when he clicks on a buttongui?

How can I Add/Remove Health from a player when he clicks on a button GUI? I have made a script but it doesn't work for some reason

local humanoid = game.Players.LocalPlayer.Character.Humanoid
local currentHealth = humanoid.Health

game.Players.LocalPlayer:GetMouse().KeyDown:Connect(function(key)
    if key == "N" and script.Parent.Visible == true and script.Parent.Enabled.Value == true then
    script.Parent.Parent.Parent.Parent.Players.LocalPlayer.Character.Humanoid.Health = 1




    end

the script if for a keybind it works the same as a button.