If you are making a website using Drupal 6.x (I am using Drupal 6.24), then you can add/edit/delete user profile settings very easily by accessing this link: http://your-site-name/admin/user/profile
But, the Profile module is deprecated in Drupal 7, because it is already integrated to Drupal 7. Although, it is still there in hidden mode to provide an upgrade path for Drupal 6 sites that used it or if you are still living in Drupal 6.x world
In Drupal 7 you can find inbuilt profile module under: http://your-site-name/admin/config/people/accounts/fields
But, I assure you it will confuse you more (at least I got confused and didn’t had courage to experiment on it) and you will not be able to add your personal and professionals tab etc 😀