How to put back??

Hi all,
I have recented joined and working on postgres. I fixed a bug that I 
saw in the mailing list. I ran the regression test that is available in 
postgres. It was successful and now I need the following details..

1) Test suits that i could get to test my code..
2) How can I put back my fix into postgres src code.. (or) What is the 
procedure that I should follow at this stage??

Waiting for your suggestions,
Thanks
Dhanaraj