What do you mean? There's a trainer in BF 1 that teaches you to enchange equipment.
Are you sure you encountered such a teacher? Because there's no enchant skill in <img src="/ubbthreads/images/graemlins/beyond.gif" alt="" />, as there was in Divine Divinity. You should have the skill available right from the start. Just equip an item which can take charms, then click-and-drag a charm on top of its charm slots.
