Press any letter to type it. You can delete by pressing the left arrow key. The down arrow key will bring you to the next line. To delete all, press the up arrow key.
Created by @DiggetyDog Thanks to my Dad for helping me with a few bugs. Used this picture for all the letters. Thanks Minecraft! http://static.planetminecraft.com/files/resource_media/screenshot/1145/oie_105317G258JpXo_799312.jpg