how to make an answer on yahoo answers the best answer?

Wait 1 hour and before 4 days after you post your question, return to your question.

There will be a blue bar under each answer you got that says choose as best answer:: Click on that blue button if you want to choose that answer as best answer, a new page comes up

Then you rate it 1-5 stars and write a comment in the space provided.. Click OK and it's Done...

You get 3 points for choosing and the best answer gets 10 points plus 1 point for each thumbs up to a total of 50...

.Any level can choose best answer for a question they have asked and any level can vote on any questions in voting.