You choose your own password there anyway.
Go to https://www.webimmune.net/default.asp
and click the Forget Password link at the right, then check your Junk/Spam folders for the email. (Yes I know, it should read Forgot Password?).
You don't have to do it online, you can email it.
Email file to: [EMAIL="email@example.com"]firstname.lastname@example.org
When submitting samples via E-mail all samples must be packaged in a .ZIP file. When creating this .ZIP file, it is important to understand that the .ZIP can be no more than 3 megabytes in size and can contain no more than 30 files. Additionally, any .ZIP file created must be password-protected using the password "infected" (minus the ""). Failure to follow these guidelines will cause your submission to be rejected. If they reply negatively respond keeping headers instact and they will escalate the case.