Ah, ok! Based on your screenshot you're at the first screen. You can enter your username and it should direct you to PublicLab.org where you can log in completely with your password. This is part of the unified login system for all Public Lab sites!
I'm currently logged into publiclab.org in the window next to it. When I click on "log in" on the SpectralWorkbench.org website menu and enter my username and click "Log In", nothing happens, the overlay closes and then nothing. It's as if I did nothing.
(Image attached is after attempting to login to SpectralWorkBench.org while being logged into PublicLab.org)
Warren, Thanks for all your help. It seems like it was something weird with my account, I logged out and am using a friends account and it seems to be working now. Bizarre. Anyway, thanks for making this community great!