You have to get an URL for a photo like the one below.
https://tse3.mm.bing.net/th?id=OIP.p9zK5CWcLGOKChZMcjS4tQHaF_&pid=15.1&P=0&w=209&h=170 Take the URL and click an area where you want to paste the image and then choose the blue box under the words, "Font Size" which is, "Insert / Edit Image" when you hover over the box with your mouse.
After clicking on Insert / Edit Image, the box will open and ask for the Image URL Paste the URL in the box and select "Insert". The Image will appear in your post.
See below. The link is above and using the Insert / Edit Image box, I was able to post it below.
See
Good Luck