No need. Not mandatory to enroll, you can participate in the contests. If you are not enrolled as a student,
• Sign up into infyni.com and log in
• Click the Dashboard tab
You can view contests that are to be held, or you can also click the Contest tab
• Click View All Contests to see a list of contests held
• Click particular contest you wish to participate and sign up
Note: Details about contest date, submission deadline, etc. can be viewed.