The PRISMA Statement is a document that consists of a 27-item checklist and a flow-diagram, and aims to guide authors on how to develop a systematic review protocol and what to include when writing the review. Anybody writing a systematic review or meta-analysis needs to fill the PRISMA chceklist and submit it along with their article. Most journals have this as a requirement.
What you need to do is go to the link that I have provided, download the checklist, fill up the details and upload it through the online submission system under the category "supporting information."
Recommended reading: A young researcher's guide to a systematic review