Okay I know the latest version of UBB has this required feature installed already but for the version below 5.45 doesn't have it..so I just make this available if anyone who has the version below 5.45 or any version that doesn't have COPPA feature and wish to install then you can try this hack...
I installed this on version 5.38d and worked pretty well...see it in action
http://www.cnclan.com/cgi-bin/ubbcgi/Ultimate.cgi?action=intro click on Register link then you will see it
codes
http://www.cnclan.com/privacy.txt