How to edit sign up form?

Have a nice day to all
I have few query regarding sign up form. is there any extra field add in sign up form?

I want to make forum for coaching classes.

I don’t know how to do make different registration form for student and Sir’s.

In this forum student have rights only make do comment on post and Sir’s have both rights to make comment and as well post.

Can anyone help me, is this possible with discourse?

This plugin will help you to build a custom signup form


It’s also super easy to add custom user fields at /admin/customize/user_fields and make them required at signup (which displays them on the registration form).