How to host images to use in Flourish

Hi guys, just wondering if anyone can help with some advice on how to host images that can link directly to Flourish to imbed in the carousel visualisation? I've got a screen shot, but it's too large to attach here. I've even compressed it.

Here is a link from their template image hosting. https://ift.tt/39tynIr

I just want to be able to replace this with my own.

from HTML & Website Design https://ift.tt/2QAoW1k
via IFTTT