Imgur.comWhat is imgur is it a website???
An easier way to do this while in-game, when you take a screenshot a white text comes up, press your type button and click on it and it takes you directly to your screenshots folderGo to your windows search button and type %appdata%
You should see a folder named .minecraft
Open it and then open the folder "Screenshots"
From there, find the picture, and drag and drop it to your desktop.
Once you have done that, go to imgur.com and click to upload photos, and you can click to upload them from your computer.