Can you see "Submit your entry" button next to "View brief" button........ Click on that and then click on "upload image" button. Select the image you want to upload describe your entry... and click the check box... you are done with it.... have nice time :)
I'm freelancer from Europe (Poland) specializing in webdesign and branding. I'm interested in cooperation. I can offer designing website and slicing project to html and css, but without programming in php (or other languages).
My projects are featured on behance.net and webdesignserved.com