Unfortunately you are not able to contact the tutor directly to ask questions. Do your best to incorporate the feedback that you understand, and send a second draft to WriteAway clearly indicating the remaining questions that you have.
If you do not understand any of the tutor's comments, re-submit your paper and tell what you found unclear, and why it was unclear to you. If you didn't find the previous comments useful, explain why and what you were looking for that you didn't get.
If you are looking for additional resources to help you write your paper, you could also send an eQuestion. eQuestions are writing-related questions that tutors will answer. From the home page (the first screen after you log into the eTutoring platform), click on 'eQuestions'.