ProjectLocker allows you to create as many projects as you like (and your quota allows). Each project has its own source code repository (Subversion or Git) and its own Trac. Therefore, each project has its own set of URLs for each of the relevant services.
You can find the URLs for each of your projects by clicking the Dashboard link on the top of the page and then clicking the name of the project on the left under "My Projects". If you don't see the project you're looking for, please have your administrator add you to that project.