[Koha] how to use OAI-PMH

Dear all, I want to use OAI-PMH for metadata harvesting. I checked manual for OAI-PMH but didn't get more idea regarding the use and configuration of OAI-PMH I am using koha-3 and my z3950 searching is not working.... And I donot have idea regarding how to configure OAI-PMH and Z3950 Anyone please suggest me regarding this. Thank you in advance, with regards, vijay kumar