You can also put the normal link from imgur or tinypic in your guide, while putting for example width=200 in the img tags. If you then use url tags with the link you also put between the img tags, you have a small clickable image that redirects you to the bigger image.
1. Download Gyazo.com or Puu.sh and use them to make easy screenshots.
2. Press pr sc (Print Screen)
Open Paint
Paste the print screen
crop it
save it
upload it to imgur.com or deviantart.com
For example:
Gives