When you write your post, you can see on the bottom left side the "Attach Files"
click on it and you will come to your harddisc files
define which photo or photos you want to upload - and click at the bottom left "open"
Than you will see your photos at the bootom of your post
click on each photo "Insert"
and it will open to "Thumpnail" and "Full image" - usually we use "full image" but it is your decision
I made an example these three photos as a Thumbnail - Full Image - Thumbnail - the photos will be inserted into your text where your cursor is in moment
afterwards the usual "Post Reply" and the post with photos is finished
I was actually able to muddle through on my own on my last post. I hope I can repeat the process before it recedes into the oblivion of my recall.
Thanks for the leg up, Uwe!