Randomize a Slideshow in 7.1?

Site URL: https://www.thesecrettreehouse.com

Hi, I'd like to randomize a slideshow on my homepage in 7.1.

Site: thesecrettreehouse.com
Password: treehouse

The artwork will eventually be by different artists, and I'd like to give each one equal air time. The order doesn't need to be random, just the starting image, although either is fine.

Thanks!

I think this require JavaScript code. you can post on some FB groups
+ Squarespace Customization Resource Groups
+ Squarespace Community

Thank you!