why is that a blunder?
If the engine marked it as a blunder, it was assuming the review was at sufficient strength, and you got lucky your opponent didn't find the right continuation.
That said, without the actual game, no one can point out exactly why it was a blunder.
If you mean this game, https://www.chess.com/game/live/105450625993, Bh6 was marked as a Miss not as a blunder. It was still winning but there were other moves that evaluated better, with d5 being best.
Yeah, I got confused with my opponents last move which was a blunder, can't fathom why. Nevertheless thx for elaborating. Still got lots more to work on.
can somebody tell me how can i enable evaluation in game? like when you do a blunder it shows that you did on the piece