Last year, the policy was that one of YOUR legal guardians had to be behind the table with you at all times, which means that your friend would need a parent or legal guardian too. That policy sucks. My sister was a couple days away from turning eighteen last year, but it didn't matter. I actually had to become her temporary legal guardian for the weekend for her to be able to help me. Look into temporary legal guardianship. It involves signing a contract and getting it notarized.