Go to the deal where you'd like to send an update via email/SMS
Click 'Update Borrower'
If there are multiple borrowers, select the name/names of the borrowers you would like to notify. Note: borrowers must be invited to receive these updates.
Add a custom message.
Check the box to send via SMS. If you don't check this box the message will only send via email.
Click 'Send Update'.

I can't check the box to send a copy via SMS, what's wrong?
If you haven't added a phone number to the borrower's account profile (this is different from the application), then you will need to add it before sending SMS notifications.