How to allow people to post pictures on my site?

Hello, I want to start a “Photo A Day Challenge” page where people can post a picture to my site. For example, the day’s challenge will be toilet and they could post a picture of their toilet to this particular page. I don’t want them to have to register or sign in or anything. Is this possible? I have no code skills and my website is very basic. https://www.erindoonan.com Thanks for any help!