Dianne --
Try clicking on the Steam icon on your desktop. If they ask for your password, enter it. If you don't ask for your password, once you're into the Steam frame you'll probably have to log in (upper right corner) and give your password there.
Once logged in, you should see the word "Games" in the top left of the screen. (It's very tiny.) Click on it, and click on "View Games Libary." That should contain all the games you've downloaded from Steam.
I hope this helps!