The Lead Sources popup screen gives you another way to edit your list of lead sources (i.e. Business Cards, Newspaper, Friend etc.) where customers come from. Each time you enter a new customer you can select one of these sources from a list so that you will be able to track where you are getting your customers. This can help you focus your advertising instead of wasting money on certain advertising methods that are not producing any results. This screen is accessed by clicking the 
button on the Customers screen. You can also edit this list from the Other Lists screen.
You enter new items on the last line with the 
button next to it. If your list is long you may have to scroll down to see this line.
To delete an item click the 
button next to the item you want to delete.