Why does my script not run multiple times? Crafting GUI

For first, you created a function in "MouseButton1Down", for this you need to use local function, and your click is incorrect

and use MouseButton1Click. you can see more here: MouseButton1Click - Wiki page

For use functions and click you need to use this:

function print_text(text)
	print(text)
end

script.Parent.MouseButton1Click:Connect(function()
	print_text("Hello")
end)

Here is your fixed script:

local name = script.Parent.Parent.ItemName
local resources = script.Parent.Parent.Resources

function bow()
	if name.Text == "Bow" then
		print("Bow Given")
	elseif name.Text == "Select a Item" then
		print("Not Enough Materials")
	end
end 

script.Parent.MouseButton1Click:Connect(function()
	bow()
end)

Hope it helped :D

Errors? tell-me on comments.