How to remove one website from Specific Category

How to remove one website from Specific Category

Here I am removing www.rediff.com from BLOCK LIST category
1. Search the website in custom categories, it will provide the list of categories in which the website is categorized.
Search the website in custom categories, to remove that website from Specific Category
2. Remove from the specific category from the list. I am removing from BLOCK LIST category.
By clicking on X to remove the specific category from the list
After clicking on X modify option will apear to remove the specific category from the list
3.Then click on modify option to change the category list.
Note: You don't have an option to modify the Default Categories. (In my case, I can’t remove rediff.com from business and all other default categories)
Click on modify option to change the category list. 
Confirmation of deleted category after click on modify
 4. Testing whether the list is modified or not
Test deleted category from the list is modified or not