Forms
Forms are a way for you to collect data and for your contacts to interact with your email marketing application. There are 4 different types of forms you can create. To collect contact information, you'd create a subsubscription form. To allow users to unsubscribe you can create an 'Unsubscribe' form. A 'Modify Details' form allows your contacts to change the information they have stored with you, including their email address and other data you've collected using 'custom fields'. Finally, a 'Send to a Friend' form allows users to forward your newsletter to their friends.