How to sell your products using yahoo answers?

After answering provide your first name and url in the from resource box.

Do not place a link directly to a sales page. This will get you banned.

Link to a squeeze page, blog or a forum with email subscriber forms.

Try answering questions related to your niche and slip your url into the reference section. Try to be naturally helpful and consider answering questions not related to your niche as well in order to pump up your profile.

Have a look at some of the top answerer profiles to see their style.

I use YahooAnswers a lot, and get my few sales mostly from it. It's a strange niche, but there are usually 3-4 new questions about my niche everyday.
First, you need to go to the advanced search, put in your keywords, be sure to select open questions only, or you'll be wasting a lot of time.
If you see that the questions are generally in the same vain, compose a general answer, with some good content, and save it in a file. I use the same answer (with a few modifications) probably 90% of the time. Guess no one does searches for answers there!
I always refer to the reference box in my answer, saying something like,"for more resources and tips go to...below"
Out of 3-4 answered questions, one usually gets voted best answer, though a sale may still be a couple weeks away.
Hope that helps!