First of all go and get this plugin
Link: Download Page
Then activate the plugin
Go to Your Skins Template > Post Bit Templates > postbit_warninglevel.
Edit the UID to ur uid no - like goto your profile and see the link ull get the uid - member.php?action=profile&uid=2
There replace all with
Sorry, but you need at least 25 posts and 5 hours online time to unlock hidden content.