Go to Twilio's website and sign up so you can get an official locale phone number to be used with twilify.
Access your google calendar's and choose an existing, or make a new one, to use with twilify.
Then grab it's id, you are going to need it to configure it with twilify.
Complete the form of twilify with the required information and press sign up.
An email will be sent to you with the link to the script, that is needed to run in order for twilify to work.
Get the link to the script that was sent to you and set it to run on your twilio's number call.
Copy and paste it to you twilio account under your number's section.
Then press save, and you are all done and ready!
Welcome to twilify.