phpBB --> can I create a custom registration form with a few selected fields instead of the generic long form.

I have a phpbb Forum set up on my webpage and I want to modify the form that people who want to register on my forum must fill out.  The current default registration page has a lot of fields and options that seem overkill (especially for the kind of people using my forum, mostly family members).  So, I 'd like to change the registration page so that people only have to enter the required username and password fields, and that's it.  I know a lot about html and javascript, but almost nothing about this php stuff.

thanks.