Hi Moolious. Before you can upload you need to go to the Voting Booth, and cast some votes (you need to vote 10 times for each image you upload). When you've cast your votes, go to the Upload Images page and follow the instructions. You'll find links to both these pages under Navigation, on the left. You might like to look at the FAQs as well, as this might answer more questions for you. There's also some useful info on the Other Stuff page. Hope this helps -)
Actually, people with fewer than 2 or so images uploaded don't have the voting requirement. To upload an image just click on the 'Upload Images' link on the left of the page.