Now that you have the resulting tweaked and resized image you can upload it to Instructables. The smaller file sizes will make for faster uploads. Now...
Step 3: Staighten the Image
Click the Straighten button on the top left and a grid will appear on the screen. These are guides for your alignment. Now click and drag the slider on the bottom to rotate the image. The image will zoom in in the process to keep the same aspect ratio.
My hand had a big angle so I had to do this twice.