You have to insert the image with [img]
So you go like this: [ img ]
https://i.imgur.com/6CPbGg8.jpg [ /img ]
You just take out the spaces that I put in so that it wouldn't show the image. Also, you don't use the web address, you have to use the image file. When you upload an image it usually gives you the file name for forum use, or you can right click on the image and click view image info (which is what I did for yours) to get it.
