Hey jiva,
welcome to android builder community.
Thanks for posting your question I’m very happy to help you.
So your answer is here - go to dependencies section install Facebook admob bidding adapter after installed successfully search in component section fb admob adapter & admob core component just drag and drop it Initialize adapter in blocks section and what you normally set admob blocks like Banner,interstitial,native rewarded your bid will work.
Note - Remember your bidding integration should be correct in Facebook or admob only then you will be able to do bidding ad test.
Thanks Regard - Pankaj Kumar (AB Staff)