How to add fields to the enrollment form

I am new (really a newcomer) to the topic of installing and configuring this platform; I have installed the Quince version through Turtor and I need to add new fields in the registration form but the documentation I find indicates that they are previous versions and/or other installation media on the one hand and on the other it is not clear to me about where I should put or make adjustments.

I had saw that is associated with mfe, but I don’t understand how modified it.

I kindly ask this community to tell me how and where I can make these changes that I require, highlighting the issue of being a newcomer to the subject and not having worked with previous versions.

Thank you again for any guidance you can give me.