I have installed the security review module and enabled it but where to see the security flaws? There is not next page that I am being redirected to, tried google but not much help.
The project comes with a README.txt file that is full of good advice. Most modules come with those, actually. I definitely suggest reading them.
-- USAGE --
Navigate to Administer >> Reports >> Security Review to run the checklist.
If a check is enabled it will be run. You can enable or skip a check on this page only after it has been run. Clicking on the 'Help' link beside each check will provide details on why the check exists and what was found on the last run.
The same menu is used for both the Drupal 6, and Drupal 7 versions of the module.