Jesus Christ.
Take a screenshot and create a picture. Paste it into paint, GIMP, photoshop, or whatever you want to use, and crop to the important part of the screenshot (you asking for the recommendation, and the admin responding). Save the image as a jpeg, and go find a image hosting site, such as dropbox, puush, imgur, or whatever. Upload the image, then copy the image sharing link. The software on the forum is finicky and if you want to post the image itself and not a direct link, the image's URL has to have .jpeg or some file extension at the end, but this shouldn't be a huge issue.