Repair is the ability to regain durability on an item without having to use an anvil or XP. To repair an item using mcMMO Repair, hold the item you wish to repair in your hand, and have a spare amount of the resource used to make it in your inventory (e.g hold a diamond chestplate, with spare diamonds in your inventory). Right-clicking an iron block while holding the item gives it back a certain amount of durability depending on your Repair level, and uses up one resource each time (e.g one diamond per right-click).