I'm surprised the site moderators haven't replied yet. I found posting photos here to be a bit more difficult than on some other forums, such as ADVrider.
What I do:
I host photos on a third-party site. I use Photobucket, others include SmugMug, Flicker, etc.
On this site I click the "Insert Image" icon. Middle row, 4th group of icons from the left. It's the 4th icon in that group. When you hover over it for a couple of seconds you'll see the "Insert Image."
When the Insert Image dialog box comes up, I select "From URL." I then go to Photobucket (open in another window) and copy the URL of the image I want to post-just that one image. Photobucket at least allows me to do that. I paste that URL in the opening of the dialog box. I then unclick Retrieve remote file and reference locally. I'll usually preview the post to make sure it looks ok.
This works for me. There may be better ways out there but I've not found them. The big issue for me is having that third party site so I can get the URL of each individual photo. I've not been successful in posting photos here using the "from computer" option.
There's folks around a lot smarter on this stuff than me. Y'all ought to weigh in and help too.
Thanks. Complicated