How to customise MFA enrolment using Auth0GuardianJS

We want to customise MFA enrolment process to capture SMS based MFA at signup using Auth0GuardianJS and allow to change it to otp later on. This docs auth0-guardian.js/example at master · auth0/auth0-guardian.js · GitHub says enable guardian but when we click on the link then it does not show anything. And i could not find it on portal. Could you please share a clear docs for the same?

Probably we could define our flow as mentioned here GitHub - auth0/auth0-guardian.js: Client library for Auth0 Guardian.