There are a number of ways you can quickly add contacts to your Messenger List. To add a single contact, open the "Contacts" menu and click "Add a Contact," or type the keyboard equivalent, Ctrl+Shift+A.
You can type in the person's yahoo_user_id or email address, or choose from the list of contacts in your Yahoo! Address Book. Just follow the simple on-screen instructions. If the person is already a Yahoo! Messenger user, a message will be sent asking the person to approve your request to add him or her to your Messenger List. If not, an e-mail invitation will be sent asking the person to download the application and approve your request to add him or her to your Messenger List.
Note: The contact will appear on your Messenger List as pending until that person responds to the request.
Where's the Contact Customer Care button? With so many improvements to Messenger since the version you're using (lots more features and reliability), we figured you're ready to move up. So get your upgrade and with the new version, rest assured if you have questions, you’ll find that friendly button on its help pages.