My account page unlock/change

Hi ,

I want to use civicrm profile page for a user for its "my account" page rather than drupal's existing one. As i found civicrm has better profile page than drupal. But when i am trying to change it using administer>>menus it is saying it is locked. Any idea how to unlock it and what should be the possible changes i need to make in url.

the current url is http://www.website.com/drupal/user/
and civicrm profile page of same user is
http://www.website.com/drupal/civicrm/contact/view?reset=1&cid=

regards,
--rafi