I have installed the multisites plugin and activated it

I have installed the multisites plugin and activated it network-wide in the network admin panel.

Then I created a new account on Google Analytics for my main network blog and I got the tracking code from Google, which I registered in the multisites plugin admin panel.

So Google is beginning to log my traffic information but I don't find the way to know which blog of my network is concerned.

I mean, in the Google reporting stats, I only see the relative url's, as:
/wp-signup.php
/wp-admin/

and I can not know which blog is concerned.

Is this a known limitation of the plugin or did I something wrong somewhere on my parameters ?