Here's what I did (in Safari on MacOS X 10.4.4):

- Logged on to SqueezeNetwork.
- Clicked on Pandora at the top.
- Filled out the fields in the "Pandora Account" box.
- Realized the fields were for new Pandora users, so clicked on "enter your Pandora account information" for existing users.
- Entered my account information and submitted it on the variant of the signup page that appeared.

Then I was returned to the previous page and saw the following messages at the top of the screen:

In a red box: "Please fill out all required fields."
In a tan box: "Your Pandora account information has been saved."
The field labels for the new user fields were red as well.

However, the existing user signup worked fine.

I'll attach an image of the screen if I can figure out how.