You are now using the old peach³ interface. This interface is only functional for staff members and reviewers.
peach³ is a system for the presentation of assignments, the collection, storage, and automated and/or manual evaluation of work submitted for assignments, and the administration of results. Originally, the system was developed with a focus on programming education assignments and programming contest problems, but nowadays it can be used for any kind of assignments that require submission of work in the form of one or more files.
If you are interested in peach³ itself, please see the peach³ website at http://peach3.nl/