Deferring your program (putting off starting it) is only for commencing undergraduate students. It's not an option if you've already completed one or more semesters of study.
If you are a new student wishing to defer your program, please visit the Getting Started site.
If you've completed one or more semesters, and you need to take a break from your studies, you can apply for program leave. Program leave is available for up to 2 semesters, more in very exceptional circumstances.
For further information, visit the Program leave page.