Help in config

I installed nagios successfully on my machine for study purpose.
Now I can see it in my web browser also.
But when I click any link on left hand side such as “Host Details”.
No information is coming on screen.
Also it shows message like =>

There doesn’t appear to be any host status information in the status log…

Make sure that Nagios is running and that you have specified the location of you status log correctly in the configuration files.

Left top corner box shows the follong information
Configuration

Last Updated: Sat Apr 21 12:00:29 IST 2007
Nagios® - www.nagios.org
Logged in as nagiosadmin

  • Notifications are disabled
  • Service checks are disabled

CAn anybody suggest me what to do next to resolve this?
waiting for your reply.