Which form should I fill in to sign up to bit.ly?

Okay it doesn't take a rocket scientist to work out that the form on the left is the actual sign-up form. BUT when I was presented with the page I was immediately drawn to the "Tweet from bit.ly" pannel. I though, perhaps I could use my Twitter credentials to sign up.

Being the curious guy that I am, I decided, to just enter my details and click sign up. That when I got the customary error traps.

Hey Bit.ly how about doing a Five Second Test? I'm certain you'll find the visual prominence of the "Tweet from bit.ly" panel overpowers your goal of getting people to sign-up to the service.

My advice

Move it to after the sign up process is complete or at the very least, reverse out the panels.

P.s. Why would I actually want to tweet from bit.ly what's the sell?