Now that you have everything you need you can start designing your sign! You will be using excel to design your sign. You fill a cell where an led will be placed. To begin, open excel and make the all the cells squares. Then click on a cell and, using the fill tool, fill the cells to make letters. This may take a few trys to get good looking letters. Remember, this is just a rough draft, you can make it look better when you place the led on the clad board.