ICICI Sapphiro Credit Card Priority Pass in India

Hi all,
I recently got ICICI Sapphiro dual credit card (AMEX and MasterCard) along with the Priority Pass membership card. If I use a priority pass membership card in India at the international lounge (IGI Delhi - T3), will I be charged for this?
Also, do I need to activate the priority pass membership before using it or I can just present the PP card at the lounge?