Hey Patrick,
I see that I can do authenticated pages like this:
On the test page under Test Options, I was just wondering how the Auth tab worked?
Sincerely,
Travis Walters
The auth tab is for testing sites that are behind HTTP Basic auth (ugly dialog pops up asking for credentials). People will sometimes do this for dev pages to prevent the public from seeing them before they are ready.
For pages that actually use html-based login forms you can use a script to test them. The second sample on this page shows how to do it for AOL mail as an example: http://www.webpagetest.org/docs/Hosted_Scripting
Thanks,
-Pat