How to Send a SMS to Yahoo Messenger

1. Log into Yahoo Messenger.
2. Right click on the name of the contact who you want to send an SMS to. Select 'Contact Details' from the menu that appears.
3. Enter the contact's mobile phone number into the 'Mobile Number' field on the Contact Details card. Include the country dialing code (in the U.S. this is '+1') before the number. Click the 'Save' button.
4. Click 'Actions,' followed by 'Send an SMS Message' while on the main Yahoo Messenger screen.
5. Click on the name of the contact or contacts you wish to send an SMS to. Click 'OK' after you have selected the proper contact.
6. Type the message into the Yahoo Messenger message field, just as you normally type messages.
7. Press 'Send' to deliver an SMS to the designated contact's mobile phone.