The Twilio section allows you to setup the Twilio API Connection and SMS details.  This is required if sending an SMS Message to contacts.

API Connection

You need to visit your Twilio Account to obtain the “Account SID” and “Auth Token” details.

 

SMS

In Twilio you need to setup a Twilio Phone Number to make the SMS Messaging work.  Once you have that Phone Number, copy and paste it into the SMS From Number field.