Hi, sorry to hear that you're having trouble sharing your projects. When I clicked on the link that you posted, I was able to see the project. It seems like the problem might be in your students accessing the web page, not in sharing the project to the web. Is it possible that the website codeprojects.org is blocked at your school?
You may want to check in with your IT department and make sure that codeprojects.org is on the whitelist for webpages.
By the way, I love the site.