Where do i change the settings of the redirected URL after a new user registers on my drupal 7 site?
Hope this will help you,

In Drupal 7 you can achieve it many ways


Using Rules, create a RULE with Event - After saving a new user account and Actions - redirect the page and if you want you can also add Conditions, as per your requirement.




Using hook_form_alter

function HOOK_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  switch ($form_id) {
    case 'user_register_form':
      $form['#submit'][] = 'custom_user_register_submit';
    break;
  }
}
function custom_user_register_submit($form, &amp;$form_state) {
 $form_state['redirect'] = 'YOUR_REDIRECT_PATH_HERE';
}

By using destination parameter 


More simpler you can also using destination parameter. Just add
the destination parameter in the URL where you want to redirect
it. You can achieve it by using theme_menu_link. You can refer this answer
YOUR_DOMAIN/user/register?destination=YOUR_REDIRECT_PATH_HERE



Note : Instead of writing the code or installing the module you can use  Destination parameter OR RULES .