Hello, I want to know how can I add a register form with more options. I want to know some things about my subscribers, because I'm building a new website for medical issues and I need to know some info from Doctors, like city, hospital, speciality, etc.

There are a plugin for this?

Hi and welcome, situ01!

You can use either of the following two plugins:
1)Simplr User Registration Form

2) Cimy User Extra Fields
wordpress.org/extend/plugins/cimy-user-extra-fields/

Hope this helps! Let us know which one you pick and how it works out for you.

Kind regards,
Nick

Thank you!

You're welcome, situ01! :)

Kind regards,
Nick