Go to www.masslao.org/ and create an account by answering some eligibility questions. You can ask up to 3 legal questions per calendar year. You ask your question on the website, and a volunteer attorney will answer your question through the same website. The volunteer attorney will not be able to go to court with you, make phone calls or prepare paperwork for you.
For more information, see these Frequently Asked Questions about Mass Legal Answers Online.