Connecting to server

I have just installed Design Studio 16.4.2 on my machine.

As per the tutorials, I was to be asked for the logon information to the BO server when I was going to run the Design Studio application for the first time.

But the logon dialogue box didn't appear, instead application started.

Now when I have created a new 'Application' in it, I am unable to connect to any data source.

Any answers ??