Please reply to alternate email address.

I looked at your help on these pages:

How do I switch between AT&T Yahoo! Mail accounts?
http://help.sbcglobal.net/article.php?item=6089

Configuring AT&T Yahoo! Mail
http://help.sbcglobal.net/results.php?category=88

Accessing AT&T Yahoo! Mail
http://help.sbcglobal.net/results.php?category=84

About AT&T Yahoo! Mail
http://help.sbcglobal.net/results.php?category=83

before finding the URL to access web mail by a lucky guess at
How can I read my mail from another computer?
http://help.sbcglobal.net/article.php?item=7085

It seems to me that this information should have been included:
 a) Right up front in the help;
 b) In at least ONE of the twenty screens we used to register the account.
 c) In one of the letters or booklets sent with the DSL materials.