After the 13th Feb, you can vary your enrollment online.
So when you have your Unikey (it should be ABCD1234), log into Myuni and click the tab called "My admin"
and there is an option there called "vary my enrollment"
i vary my enrollment pretty much every semester. As i take my time deciding what i want to do and making my timetable works for me.
You vary your enrolment online upto 20 times.
"vary your enrolment" means dropping and picking up subjects.
They only times you can't vary online is when the course have prerequisites you have haven't completed or if it says "departmental permission", if you have some weird subject that you can't apply online.
Tip:
Part of my degree involves electives, so I usually OVER-enroll at the beginning fo the semester, and then go and try the subject out in the first few weeks, then i decide if i like the lecturer, or if the assessments looks ok....so on the so forth.
if you need more help just PM me!
Cheers,