Vary for images Help

Desperately need help with Vary for Images.

I’m not a coder but have been dumped information about Vary for Images by ‘support’ with no direction as to what I need to do where.

My issue is, images on Safari do not display with the Cloudflare cache and essential break my site. The links I was sent was:

"I would recommend that you use vary for images. that should solve your issue.

Vary for images

You can read more about it here:

Please don’t hesitate to come back or create a new ticket if you’re still having issues"

How do I solve this because at the moment I’m having to switch to development mode every three hours of the day to stop it until I find a resolution.