Featured Slider Issue

Hi, The slider was working fine until I accidentally put 1963, the post !D into the first box instead of the second, resulting in 1963 featured posts to load. I don't want this, as I only was 6 but every time I try to change it, the following appears after loading: "Error 404 - Page Not Found. We’re sorry! This page is not available. THIS MIGHT BE BECAUSE: You have typed the web address incorrectly, or the page you were looking for may have been moved, updated or deleted. PLEASE TRY THE FOLLOWING OPTIONS INSTEAD: Check for a mis-typed URL error, then press the refresh button on your browser or Use the search box at the Header." Please help as I can't get this to work! Thanks.