Hey whats up dudes and everybody!
Ok, so without getting into details if you want to post screenshots, use any site that hosts images. For example imageshack . us is one of them...
Here is how you would do it with that particular site:
1. Go to imageshack . us and upload your image
2. After the upload done, you will get the DIRECT LINK to the image. Copy it.
3. Come here and hit "Quick" and choose "Insert Image" (Little yellow square with mountain and sun, LOL)
4. Paste the URL you got from imageshack . us into the field and hit ok
You are done. Really simple. If you have questions, please ask here.