jHeidi for iPhone - How it works?

I've just purchased jHeidi for the iPhone on AppStore and I want to know how can I connect to an Oracle Database.
If I run the application when I'm connected using 3G network the application starts and I can add or edit profiles. When I try to connect to the database, the connection fails because it is unreachable (that is correct).
If I run the application in a Wi-Fi network (where the database can be accesible) the application can't start (the screen appears totally blank)
Someone can help me? How it works?

Thanks.

If you suspect a bug, you may want to file an issue at http://bugs.heidisql.com/