When you have completed your unit or entire site and are happy with it and ready to put it on the internet, you must submit your site to your teacher. This is done through the submission process which you will be taken through on the submit page.
The teacher will check there is no inappropriate content or copyright issues. If everything is ok, it will be published on the internet and will be available through the iluv2 site.
for an explanation of how submitting works, there is a short movie you can watch on the submit site page