Instructions
Press the "I" key to open the inventory window.
Press the "E" key to open the equipment window.
Find the enhancement scroll in your inventory, and then find the item you want to enhance in your equipment window.
Apply the scroll to the item. Click on the scroll with your mouse in the inventory window to pick it up, and then drag the scroll on top of the item you wish to upgrade in the equipment window. The scroll will increase the item's stats.