How to text a contact?
To send a text message
1. Open the Bigin app on your iPhone.
2. Navigate to the Contacts 
module.
3. Select the desired contact record.
4. Tap the Message 
icon that can be found in the middle of the screen.
Type your message in the text box, then press the arrow icon to send it. To exit the text window, tap "Cancel" in the top right corner of the screen.