Screen shot, put in MS paint, cut direct from there into the forum text box. If you're on PS4, use the website rune manager.
http://www.poxlist.com/ recently got active, its updated and has a bg builder. its better than paint because if you dont know the image you can check the runes.
Can someone tag the owner to try implement a quickview that includes only a picture of the runes so that vets like us have a far far easier time checkING out the BG? Cheers
btw when you build the bg you can see only images in the search part of the site, on top right if you click on the worktable with the angel of pain. then if you go in bg you see also all the skills and rules of each rune, and you can link the bg