Your issue is that you don't have the direct link copied. To get the direct link, right click on the image and click "copy image url"
This way you don't necessarily have to use an image hosting site like imgur, you can really take from any website you use. I use a prntscrn program and I can upload the photo as soon as I take it.
Lightsoft is what it's called. Gyazo also works the same way but has more capabilities like creating gifs.