Student or Learner
So I was watching TV when I heard " How'd ( or why I don't remember ) you find this out?" did he use Had or Would ? And what didn't he say " How DID you find this out ?"
Why? Because it's normal spoken English to say "How'd you ..." for "How did you ..."
Note that this sounds very much like "How d'you ..." for "How do you...", but the clue is in the context.