To get it working you need to set a user/password for your QT wallet. This is done by editing the syscoin.conf file. You can find it by going Start->run and typing

%appdata/syscoin

and then editing it with this info:


Then restart your wallet. Now you've got the wallet ready for services to connect to it. In the folder that you downloaded the marketplace app in, there is a settings.inc file. Edit that, and replace the placeholders with whatever you put in the above code, and it should launch straight away after saving that file.