Which page are you referring to? The info for this home seems to match that which I find on your listing website.
There is a link at the bottom of the page in the footer called Advertisers.http://www.zillow.com/showcase/GetStarted.htm?s_cid=ez-site-adwithus
First you have to say it is for sale (as either the owner or the agent) and in the process of saying it is for sale, you can specifiy open house times.You can say it is for sale by going to the "Home" tab, and clicking "Posting Home for Sale". Or you can go to you home, and click "Tell us it is for Sale".http://www.zillow.com/postings/Postings.htm?s_cid=homes-site-topnavhomessub
How about this one?
Yes, the site is always a work in progress. Would love to hear specific suggestions on how we should improve the UI for the Advice section.
Kevin, sorry about this. Let us look into it and we will get back to you. Rest assured, we will make sure that in the end, you are only charged $25 to your account for your signup.