You appear to be trying to put the Imgur website link directly into the [ img ] tag, rather than the embedded link. When you've uploaded to Imgur, click the 3 dots in the top right of the picture, choose 'get share links', then copy the 'BBCode' output:
The link should be in the format "
https://i.imgur.com/_______".
If the method above isn't working for whatever reason, right click on the image in Imgur and 'open image in new tab' (or any equivalent wording on other operating systems), and this should open a page with the i.imgur link you need.
If all else fails, just provide the Imgur link, but of course it's ideal if you can embed the images directly.
