mmm... yes... you are right.

Is there any way to stablish users categories?

Thank you once again.

No, sorry. That feature is not supported by this plugin. I believe that you may find ones that do support user categories in the plugin repository.

Thank you very much! I think I will see if I can do what I need with groups.

You can easily add existing profile fields to your form - just use the same internal names and types.

If you are still seeing just the default fields on your main profile, something is wrong. Perhaps it is a plugin ordering issue. The order should be: profile/form/flexprofile

Thanks Kevin.  The order is exactly as you say.  I made a test install of Elgg to play with and found out it's actually my theme that's causing the problem.  If I use the default theme the user profile form replaces the default one perfectly and exactly the way i want.  When I switch to the new theme (from hypeJunction, formerly the seashells theme which also has the problem), the profile is blank and is only visible if I turn on the default Profile format and select Extended Profile.

If you can think of anything I should check I'm open to suggestions :)

You could try ordering flexprofile after your theme.

Fixed in my copy - thanks Ruben!