Just to clarify, the stats area uses the same user/pass as the CNC. However, if you ever changed the password then they would no longer match. So, I would first recommend trying to reset your stats password.
You can modify the stats password from your CNC, click on the "Change Password" link in the left navigation and then scroll down and you will see "Change Password for Stats section".
If you still have issues after changing the password then let us know by sending an email to
Service@FutureQuest.net
As for what the stats show, it breaks down things like:
How many visits your site is getting (this can be broken down by hours/days/months/year).
What site referred visitors to your site and other aspects of how someone got to your site.
I would also suggest reviewing these articles to help interpret your stats:
https://service.futurequest.net/kba27
https://service.futurequest.net/kba28