Assuming they're custom profile fields, you can require them to be filled out during registration through the Custom Profile Fields Manager in the AdminCP.
I entered some fields in the User Profile Field Manager and selected them to be required during registration, but they don't show up for new users. Did I miss something?
Really? When I create a custom profile and select it to be entered upon registering, I don't see the field when I try to register a new account. Am I overlooking something?
I'm wondering if its possible to make a field for the user to select their date of birth without having to make a seperate field for day/month/year of birth.