You may add pictures of your recipes to any forum post by clicking on the insert image icon
in the editor. Sometimes you have to choose advanced to see that icon.
There is a catch to doing this though. You need a place on the web to host your images. A free place to do that is
Image Hosting. It's fast and free. You simply upload your picture to imagehosting.com and they'll provide a link that you put in your post. Simple, easy and free. Sweet!
Oh a general nice guideline for images is keep the size small. JPG quality 60 is fine in most cases. Lots of folks say 30k and under is best for filesize. I think you'll be ok at 60k. Image width and height need to be considered; these play a major role in filesizes. Sizes of images in pixels of 400 width and 400 height won't overly push the text in your post around. 300 x 300 might be a better size.
Sample image sizes:
Recipe pictured is
Savory Oriental Seasoned Chicken Wings.
Matt