There are two ways you can add a list to your sign-up form: In the left-hand navigation, click Contacts > Lists > View Lists. Next to the list you would like to use, click the button from No to Yes to add the list to your sign-up form. Another way
1. To add multiple subscribers, go to Audience > Manage Contacts > Import Contacts > Add Multiple Subscribers: 2. Type in or copy/paste one email address per line. The first line must contain column names. Separate any additional information, like first and last names, with commas or tabs. Then, click Next Step. 3.