If you look at any images on imgflip you will see a share option, you click on it and you'll see "image link" and "BBCode link (forums)" and image HTML. You're clicking on the middle one which says "BBCode. After you click on it, you have to copy it, and then take it to where you want to comment then paste the BBCode link into the comment. Then delete everything in front of the second (https) and everything after the word (gif)
This is how it should be after you follow my instructions. Try it out for me to see. :)
https://i.imgflip.com/2li8a0.gif