PRISMA flow diagram interpretation for med school term paper?

I am a third-year medical student who has to submit a systematic review protocol for my research elective by Friday night. My PI sent me a draft but the PRISMA flow diagram section is completely blank, and I have no idea how to structure the 'Interpretation' subsection without just copying a template I found online. I need to know if citing a published protocol example is considered plagiarism or acceptable practice for this specific coursework deliverable.