After a hard search and work, i got success in changing the description of profile.php.
First i used a description that is same for all profile:
this is the description i used before
View profiles of members of Buddy Net and add them as friend, contact them, share photos, videos, sounds and much more.
but now i changed it to this:
Prashank Abhishek is using Buddy Net-Indian social network to connect with friends and family. Join Buddy Net-Indian social network to connect with peoples you may know or make new friends.
This is what facebook use to display profile owner name in the mata description of his/her profile and its really a very good search engine optimization.
I was wanting this from long time bet never tried it deeply to accomplish this.
Today i searched files for many functions and variables but that was the waste of time because the answer wasa very simple.
Here it is for people who want the same.
open profile.php
find $_page['header'] =
after it, add this
$oSysTemplate->setPageDescription("" . $p_arr['FirstName'] . " ". $p_arr['LastName'] . "this is the description for profile page. ");
just over nothing else.
here . $p_arr['FirstName'] . " ". $p_arr['LastName'] . displays the full name of the profile owner. You need to change this "this is the description for profile page." to something of your choice.
It is simple, don't you think but took me 6 hours to figure it out.