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There are little icons on the left next to the number of points the question or answer has gotten. Click on the one for "up" to give points, click "down" if you think it is not a good question.

Similarly, though I don't believe they currently give points, you can click on a little uparrow next to comments. This picture shows one where one person has done so.

For your votes to count you do have to be logged in, but apparently you are. Good luck!