If you upgrade your computer software, change computers, delete your Internet files, or click "Sign Out" at any time, the cookie will be erased from the computer's hard drive.
To restore your personalized information, just enter your Yahoo! ID and password in the spaces provided either on the Sign In page or Guest page, and click "Sign In". You do not need to re-register.
If you have forgotten either your Yahoo! ID and/or password, just click the "Need help signing in" link on the Guest Page.