How would one go about searching someones email address? I have all the information on this person including full name, home address and phone #. Now I know that they do in fact have an email address, I think it's Yahoo, but I'm not sure. So how could one find this?

Only way that you could find this is if they (or someone else with their address) has published it in an email directory or on a webpage.

doesn't email ferret search for addresses based on the information you give it?

If its yahoo you can TRY this http://members.yahoo.com/

It all depends on weither or not then put in their REAL info when they signed up, most email services (yahoo, hotmail, etc...) have these