User Signup help

Hello, I am building an application where users should be able to sign themselves up into the system. How do I automatically assign role to them upon sign up? I would assume it would be through a microflow but I have the button on the sign up form set to save changes and I'm not sure how to build a microflow that would save the user's information into the database entity while assigning them the role at the same time. Any advice would be appreciated.
1 answers

Here is a screenshot of my domain model in my app module. Basically I have Parents, Babysitters and Admins as their own roles and parents and babysitters have their own sign up forms each and I would like to assign them their respective roles automatically upon sign up.