The Yahoo! Groups web site requires that your browser accept cookies. A cookie is a small text file stored by your browser to help identify you. If your cookie is not accepted correctly, you’ll be signed out of your account as soon as you move to a different page. Some older browsers are not able to accept cookies.

Please make sure that your browser is set to accept all cookies. If you’re still having trouble, try closing all windows and then deleting the cookie files in your browser's program directory. Usually, these files are called "cookies.txt" or are stored in a folder called "Cookies." Then, try signing in to Yahoo! Groups again.

For more information, please read Yahoo!'s policy regarding cookies.