Instructions
Equip any enhancement ring to one of your characters. Any item that can be equipped in the "Enhancement" slot is an enhancement ring. The effect of each ring appears when you highlight it in the "Equip" or "Item" menus.
Click "Attack" during battle. Only the standard "Attack" command allows you to use enhancement rings. Two rings appear immediately after you select "Attack."
Hold down the right trigger on the controller to cause the outer ring to shrink.
Release the right trigger when the two rings overlap. The goal is to have the outer ring overlap the black band on the inner ring.