It sounds like you are referring to RealtyTrac. I would suggest contacting them directly using the link below.
Account Manager | Trulia
If you have questions about a specific property you see on here, direct from that page, you can ask questions about that property, and a specialist will be happy to answer any of your questions. We can usually find it in the MLS by the MLS number, address, zip and price, or other factors.
Also, if you'd like, you can e-mail me your search criteria and I can set you up with recommended and available property searches with your criteria.
If you are looking for All the homes currently for sale on the market- MLS - realtor.com....then you need to sign up for a MLS search, you can specify area, price, zip, bank owned, etc.
There is no cost for the MLS search to be sent directly to your email