OP - posting pictures - maybe I will only confuse you - some of us pay a membership - lets us post pictures directly from our computer to this website - we use the "Insert Image" icon. Before I did that, would have to load and post picture to another website - somewhere else on Internet - then post the link (the "URL") to that place, on this site.
Without buying that CGN membership, I do not think it is possible to directly "post a picture" to this site. There is a way to do it, without a membership, but I gave up on that some time ago..