My question is stupid, but....... How can I submit the best answer for my questions on yahoo? I couldn't find how to do this.
go to your question page.. there, you'll see "choose as best answer" option below every answer. Just click it and confirm it.
Just to remind you that yahoo could suspend your account. And when your account got suspended you will lose it forever although you have 1000 or 5000 point. They usually never reverse their decision although you are given a chance to ask for reinstatement.
Redspace, I think he was talking about picking which answer was best from other people's answers to his questions, not trying to select his own answers as correct through trickery