You may edit/delete your article by logging in and clicking "My Profile" in the top right corner. Once in your profile select the News tab. Locate the item you wish to edit/delete and click it. Once on the article page you will need to scroll to the bottom where you will see the options to edit or delete. If you'd like to make some edits then select the "Edit" button. Make the necessary changes to your submission and hit save your article. That's it!
Please note that once you delete an article there is no way of resurrecting it.