At what point does a Hubzu offer become binding?

[Simon Stahl]

Hi

one of my Hubzu bids just got approved. First, they want me to complete a contact information form within 24 hours. After that I am supposed to get the "PSA and associated documents" (not sure what exactly that is). Is anyone here familiar with the Hubzu purchase process? I wonder at what point the offer becomes binding and I cannot pull out anymore.