On your Class Portfolio, you will see a list of all of the class assignments. The second column is the "Info" column. If you hover your mouse over the blue info button for the assignment you want to see, you will see the description of the assignment. For each of the Othello test questions, I've also included a rubric of what I am looking for when I grade the answer. To access the rubric, click on the gray box-like structure to the right of the Info button.
Because of the way Turnitin structures the info materials, it might be easier for you to keep the assignment list visible while you are working on the Othello questions so you can hover over the info button as many times as you need to while you work. You would simply type your answer in another program (Google docs, Word, a Notes app, etc.). Once you have the answer finished, then you could just copy and paste your answer into the answer field in Turnitin to submit your answer. This would also allow you to save a copy of your answer in case Turnitin loses its mind (and your response). Directly submitting your response in the answer field will also make it far more likely that Turnitin won't lose your submission in the first place.