Read through it and look for the moments when you are most interested in replying to any of the writers you were dealing with. Look for moments where you think an author is wrong; look for moments when you agree with an author but want to say more. Make a list of at least THREE such moments, and write each one up in the following format:
Author X argues ___[summary of what Author X argues]___________________, and I think ___________[brief statement of your viewpoint]_____________________________ because ___________[brief statement of basis for your viewpoint]_________________.
You have to fill in those blanks with your own writing.