In your dashboard click TEXT MESSAGING > SEND TEXT MESSAGES. Once there, click on +New Text Message () at the top to create a new message. Then, enter your message in the box, and click Proceed to Step 2 ().
From here, you'll want to look for the title SEND TO GROUPS. Click the +Add a group to this message link to add a group(s) to your message. Once there, you'll choose the desired group(s) and click the save button ().
Once your group(s) are added you can schedule the text message or click the SEND NOW button ().