Thanks Trudy.
I came to know that only QC site admin has a right to do client Registration. Normal user or even QC admin cannot do on his own.
Today i got updates from my QC support team that they dont have rights to provide QC site admin role and even none of there members have it. Now i think it is becoming more complex.
Even simple piece of code cannot be executed without registration. Now i need to work only on client Registration which i do not exactly know how to get it, else my complete tool will be dumped.