Can not reply to messages in yahoo answers?

If you really NEED to get more information from somebody who has answered a prior question of yours, you CAN simply click on their avatar and see if they allow it. Some do, many don't. But other than that, you need to ask again if you did not get enough information the first time, preferably with MORE information next time around to see if you can get better answers.

Because Yahoo Answers isn't for discussions. This isn't a message board. It's for getting information and advice. You ask a question, it gets answered, then you move on. There is no way to reply or continue a thread of replies...

Y!A is not a chat room. It is a knowledge-seeking site in a question & answer format.

You have three options:

You can go to the user's profile & see if they accept IMs and/or emails. If so (and you allow them too) you can contact them that way.

You can make 'comments' when you pick your Best Answer.

You can use the 'add details' function to add additional information to make your question more complete or understandable. Be careful what you add though, you don't want to have your question reported as a chatting violation.

:o)