If you ask the server to display instructions and Help in a language that can be encoded differently (for example, in the Japanese language, you might want EUC or Shift-JIS encoding), the AnswerBook2 server asks you to specify the encoding. To respond to this query, click on the encoding scheme that reads "correctly" to you.
You might also have to change the encoding of your browser to match the encoding of the AnswerBook2 interface.