Save the template egg to your computer. Open it in either paint to decorate it or sumopaint. Then when you're done, go to tinypic, upload it and highlight the last url. Copy it. Go to "official contest" thread, post a new thread. click on the "Image" icon next to the smiley face one, paste the url that you copied, insert and you're all done.
If you have any questions, feel free to respond on here or message me.