What should I do to make subscribe_multiple.php handles more than 3 options? I have 14 or 15 lists, but I want just 12 on my subscribe_multiple.php page.
You have to modify the code, the form to be exact. Do a search for 'list1' and you will see all the places it is used. If you have problems with PHP the best is to ask somebody that knows how to do it.