These links are spoilers...

Maybe this will help you, this is how to get into the Merchants guild.

http://lariancom.siteprotect.net/ub...sed&sb=5&o=&vc=1

Here is a map of Verditis...there you will find Corrina's house...


http://kiya1.via.t-online.de/images/Div_Verd.jpg
Thanks to Kiya for the maps.