You cannot delete content from Ask once you've submitted it, so please be sure anything you ask, answer, or comment is something you don't mind being on the site and that it follows the Ask.com guidelines. The only time items are removed are if they are in violation of the guidelines and remove by a moderator.
You can't delete a posted question or answer or comment you done. Only the moderators are able to do that. But for your recent questions and answers you can edit them if you want through 15 mins only from posting them.