If the region is not green, it will have an upload icon

Click the icon, choose the file, mark that you are not uploading copyrighted material

Your image will be analized and receive a technical score

Do not submit the image unless the score is higher than 7

The image size is lower than 800 x 800

You have not compressed the file with PNGgauntlet and Emage

Your file is not entirely square (e.g. paint sometime produces 801 x 800, when saving)