To add multiple contacts in a list, in the ADD CONTACTS dialog box, click the 'ADD MULTIPLE' button.
The browser displays the fields for adding multiple contacts in a list. Click the 'List name' drop-down list and select the list to which you want to add multiple contacts. In the text area provided below the List name field, enter the email address of the contacts that you want to add in the list. After you complete adding the email addresses, click the 'ADD CONTACTS' button.