The first place to start is pictures are under the "Go Advanced" options.
I have an old school camera, I think most people with a phone send the picture to themselves via email and then post it from there. The FAQs here are great, first two are about posting:
https://www.quiltingboard.com/qb-help-center-f27/
With my camera and browser etc., my file sizes are almost always too large so I go to this site to reduce them. It was easier to use but just got changed a week or so ago, is still easy just a couple more clicks than I'm used to, and it still doesn't set off my browser protections.
https://www.reduceimages.com/
Once downloaded from there to my system, I am ready to go advanced and post.