1. Take a screenshot 2. Open files 3. Push Ctrl + H 4. Go to your .minecraft folder 5. Open the screenshots folder 6. Find the screenshot 7. Open forums 8. Drag the screenshot from the folder to a post 9 (optional). At the bottom of the uploaded files section in the post, there is a button that says "full image". Click the button to have the image take up the whole post.
