What is the signature of the key of F

Well that's not true at all, it's clearly in reference to sheet music.

oh, still, the person didn't explain it, im a kid anyways ;D

Well a tip for next time: Don't assume that just because you don't get it that nobody gets it. Like you said, you're a kid, you still have a lot to learn.
So here's today's lesson: You're an individual, you don't speak for everyone.

i think you spend wwaaaaay to much time cyber-bullying people than you do hanging out or doing normal stuff in reality, but that's just one KIDS opinion, thank ya very much

Thanks haha you rock!XD and sooooo true!XD