Is your home listed for sale?? If so, you need to contact your Realtor. However, I have a feeling you're just referring to an old listing or the public records info on your property. If that's the case...why do you need to change the photo?? Most people on here are asking to have their photos REMOVED for obvious security and privacy reasons.
Keep in mind, this site is really just a marketing site for us agents, and it's basically a database of properties -- for sale, for rent, or just old public records. If your home isn't listed for sale, I'd ignore this website completely. It's notorious for inaccurate, outdated info. Frankly, I wouldn't waste your energy on it.