How do i change vaule upon a gui script?

So i made this but i don't know how to change the vaule would i write something like add? code

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
local done = false
local disconnected = false
local deb = false
plr.Character.ChildAdded:Connect(function(x)
	mouse.Button1Down:Connect(function()
		if x.Name == "Dig" then -- change to the tool name
			if deb == false then
			disconnected = false
			if x.Parent == plr.Character then
				script.Parent.PutInStarterGui.Full.Visible = true
				script.Parent.PutInStarterGui.Full.Miniature:TweenSize(UDim2.new(1,0,1,0),"Out","Quad",1)
				wait(2)
					if disconnected == false then
						workspace.Main_Dig.Dig_event:FireServer(mouse.Hit.p)
					end
				script.Parent.PutInStarterGui.Full.Miniature.Size = UDim2.new(0,0,1,0)
				script.Parent.PutInStarterGui.Full.Visible = false
			end
			else
				deb = false
			end
		end	
	end)
end)
mouse.Button1Up:Connect(function()
	disconnected = true
	script.Parent.PutInStarterGui.Full.Miniature.TextLabel.Text = script.Parent.LoadBarPercentage.Value
	script.Parent.PutInStarterGui.Full.Miniature.TextLabel.Text = script.Parent.LoadBarPercentage.Value.."%"
	script.Parent.PutInStarterGui.Full.Miniature.Size = UDim2.new((script.Parent.LoadBarPercentage.Value*.01),0,1,0)
	script.Parent.PutInStarterGui.Full.Visible = false
	deb = true
end)