Though you can assign a name to a task, you do not have to. If you have not supplied a name, task is named automatically with the title of the main page of the task. If you have downloaded many pages from the same website, the titles of the pages may contain the same substring such as the name of a website.
You can delete a substring from the names of several tasks with a single operation. Type in or cut and copy a substring to the provided text box or leave the suggested substring in the box and press Ok.