You don't directly. YA is not a chat room. You have two options: 1.
E-mail or IM the user through their profile. 2. What until you pick the BA and add cooments for each user.
Probably only the Best Answer will see it since they only get a notification. The ONLY exception is that you can add additional details to your question for clarification of the question. Do not call users by name doing this or it will be deemed chat.
There is no way how. Yahoo Answers was meant for you to ask your question to seek knowledge and to gain information. You can't reply to other people's answers by answering other people's questions because Yahoo Answers isn't a forum or a chatting room.
You can't answer your own questions either. If you want an answer to another question, just ask another one or if you want more answers extend the expiration date so therefore we all have more time to answer your questions.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.