How can I do this?

Need to post a question on Yahoo Answers and then answer from another account without getting banned. I am a newbie and know that I should use a proxy but don't know step by step what to do. What is your method? Your help would be very much appreciated. (What software/plugin to use and and other steps). Thanks!

Build an imacro with private proxies which rotate on tab close

edit:

I guess I should give a bit more info. Use firefox Imacro addon and for the proxy swaps use 'Proxy Tool' firefox addon.