You can send an IM, text message, email, or place a computer-to-computer call from the Address Book tab using Yahoo! Messenger:

1. Locate and click the contact in your address book.
2. Click the icon of the desired form of communication. (From right to left: IM, text message, email, or place a computer-to-computer call.)

Please Note: You must have the required information in the "Address Book" field to perform one of the above functions.