Hello Miss Rekha Arora, The link to online registration for MBA course is present on the home page of the official college website. But then also, Ill provide you the links so that it would be easy for you:

Christ institute of management official website: http://ncr.christuniversity.in/

2019 MBA course registration link: https://kp.christuniversity.in/KnowledgePro/uniqueIdRegistration.do?method=initOnlineApplicationRegistration&gl=2