Ensure you have a twilio account to proceed

1. Create Notify service in the link below https://www.twilio.com/console/notify/getting-started

2.Get "SERVICE SID" ISXXXXXX.... from step 1

3. Get "ACCOUNT SID" and "AUTH TOKEN" here https://www.twilio.com/console

4. Enter the credential to plugin fields

USERNAME == ACCOUNT SID
PASSWORD == AUTH TOKEN
SERVICE SID == SERVICE SID
   
NB: SERVICE SID is same for all-fields in the plugin