Morrowind Enchanting Help?

Hi I'm trying to make an enchanted Item that is a constant effect enchantment, Shield is what I'm adding, only problem is I cant change it to constant effect it just stays as a cast spell and I dont want that, my enchanting is 200 (used console cheat) i have plenty of money and i go to the enchater in balmora to get the enchanting done, how can i make it constant effect?