How do you contact other Yahoo members from the Answers section?

First, enable your email.

Go to the home page

http://answers.yahoo.com/

click the wrench right side of the window. Scroll to: Answers Community. Check as below: Can contact me via email(Your address will remain private)

Can contact me via Yahoo Messenger

(This will make your messenger and Yahoo Id visible to Answers community)

Click save.

Now you could click on their avatar, if they accept ims or emails click on the appropriate one and follow the prompts. If the question is still open you can click on the "pencil icon on the bar below your question then "add details" to clarify your question, unfortunately many posters never return to see your added details so you are still best to enable your email and try to contact them that way. You can also comment when you choose best answer to your question however most members who answered your question probably won't see your comment

It is done the same way as in the green version. Go to the user's profile by clicking on their name/avatar. If they allow email, there will be a link displayed for that.

go into their profile and see if they allow contact of some sort (PM, IM,etc)

However if they don't, then of course you CAN'T contact them