click SHARE and then BBCODE on the image in flickr, then you have some options, If you copy it as is, it will be this and include a link back to the site:
[url=https://flic.kr/p/bvcqF9][img=https://live.staticflickr.com/7195/6893975302_9982420b91_k.jpg][/url][url=https://flic.kr/p/bvcqF9]Greyhound[/url] by [url=https://www.flickr.com/photos/24676003@N04/]Tara Cremin[/url], on Flickr
Greyhound by Tara Cremin, on Flickr
you can manually copy just the img tags, and get this:
Or just post the image link without any tags and the forum is smart enough to convert it.