There are a few ways:

• If you log in, a number of links appear in the white bar at the very top of your screen.  One of these is My Listings.  If you click on that, you'll see all entries that you have added, and clicking on those will take you to your page.
• You can search for your entry in the right hand search box on every page, using the business name.  If you can't remember the exact format of the business name you entered, type just a part of the word that is more or less unique.  (You don't have to select the location unless there are too many search results.)
• You can use the search box at the very top of the page.  This is powered by Google and, if your entry was only added recently, they take up to a day or two to index news entries on the site.