You need to do a quest to get Bedwyr's enchantment machinery going; he should have a speech option about that. I delayed turning in most quests until I had explored pretty much everywhere in Aleroth that I could get to, so mostly used my battle tower enchantment machinery (no need to talk to the enchanter).
If you get into the enchant/unenchant function by using the machine in your battle tower or talking to either enchanter, then the formula in your inventory will get added to what is available to put on equipment, or you already have them, and can sell those formula.
