How do I vote "thumbs up" or "thumbs down" when reading questions and answers?

Get 250 pts. and you'll be on level 2. Then you can "rate" answers with "thumbs up" and "thumbs down." Just click on the “thumbs up” icon to give someone a “thumbs up” and same with “thumbs down,” click on the icon to award one. It doesn’t cost you any points to “rate” an answer.

Answer a question and get 2 pts. Ask a question and lose 5 pts. Choose the "best answer" to your question and get 3 of those 5 pts. back.

Be chosen as "best answer" and get 10 pts. plus 1 bonus pt. for each "thumbs up" your answer received. There’s no deduction for “thumbs down.”

Vote for "best answer" on unresolved questions where the asker was too lazy to choose "best answer" and you get 1 pt. per question. You also get 1 pt. every day for just logging in. It’s as easy as that!

Good luck, you'll be on level 2 in no time and then aim for level 3 (1,000 to 2,499 pts.)

You have to be at least level 2. When you are level 2+, the thumbs up and thumbs down buttons become blue and you are able to click on them (but not on you're own answer). Hope that helped =D