I have several mailing lists that are not the same, but only want one sign up form on my website. When I go to associate my sign up form, it won't let me pick all of them, just one. Does this mean that they will not go to the lists they pick? If I associate the list with my general "Contacts' List, but they pick Speaker and Author from my lists on my form, will they only go to Contacts, or will they go to all three subscriber lists?