Instructions
Log in to your "MapleStory" character that has the item and scroll that you wish to use.
Open the "Equipment" window by pressing "E" or by clicking the icon from the bottom of the screen.
Open the "Item" screen by pressing "I" or clicking the button on the bottom of your game screen.
Click and drag the scroll from the "Item" screen to the corresponding item on your "Equipment" window. Whether the scrolls work or not, you will see an animation and a confirmation in your chat/update bar.