Getting an image can be a little tricky, but if you know the steps it gets much easier.
1- Go to www.imgur.com
2- Find "upload image from computer", and click on it.
3- Find the file w/ the image, and put it into imgur, then upload it.
4- You will get a page with a bunch of links and options, find direct link, and then copy that (command C for mac, ctr C for PC).
5- Then find the little tree next to the little chain link on the top (under the title and above the body, were the bold and underline are)
6- Copy and paste the imgur link into that, and there you go. Here is an example image!
NOTE!!!: MINECRAFT SCREENSHOTS ARE VERY LARGE! THESE ARE THE STEP(S) TO MAKE IT SMALLER.
1- When you are in the imgur screen with all of the links, look at the top right, and see the More Sizes drop down menu.
2- Select "large thumbnail", from the drop down menu.
3- The links will change, copy the new one.