[@Chris488]Add a picture by selecting the icon that looks like an image, and then between the two tags paste a URL to the image. If you want to use an image on your computer, what I do is upload it to something like https://imgur.com/, open the post in another tab, and then use that URL.  Sort of a convoluted process, I know

*The icons are at the top of the text box for a post. if you want to type the tags manually, type (img)URL here(/img), replacing the parenthesis with brackets.