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Click the search spy glass at the top. Then type in upvote for the search. This is how I learned so much about the site and what is does. Good luck...

well, the more you vote the less weight you have for each vote, so vote carefully, yesterday i vote 50 times, and 1 of the vote post earn $1000, but i only got like 10 cent, if i vote only 5 times i would get a dollar

You have the wrong idea. Don't upvote for the rewards upvote content you actually like and want to see more of. You can't predict the rewards you can help chose the content that is rewarded.

I never said I was doing that. I upvoted a post I actually liked and it got popular I just happened to be one of the early ones.