@JamesCWilliams Good question! In the Discourse or Phrasing module, click on the Print button to save the Phrase/Arc/Bracket as a JPEG.
Then, once you’ve start to write a forum post, click on the right-most button above the text box. It looks like a cloud with an upward-pointing arrow in it. You can select your JPEG saved on your computer from the window that opens, and it will attach it to your post.
Just make sure it’s not too large - I’ve had trouble with large images. You can save it as a smaller-sized image when you click Print if the image won’t load.