1. Click the down-arrow on the side of the New button.
2. Click Text Message (SMS).

   This opens a box at the bottom of the page to write your message. You’ve got 152 characters—including spaces. When you’re done, press Enter on your keyboard or click Send.

From your Yahoo! Address Book

Click the mobile phone icon next to a phone number in your address book. From there, just enter your message and click Send.