In general, when you have the required security privileges, the application supports direct modification, removal, and deletion of data. For example, you can directly input a value over an existing field value or select an entry in almost any list or table and click 
Delete to remove an assignment or delete an item. In some cases, certain additional security settings might be required. You should also be aware of subtle differences between removing an item and permanently deleting an item. Be aware that there may be undesired consequences of your decision to remove or delete an item.