Being your own boss on Mycare means that you are responsible for organising your own KiwiSaver contributions. You will need to find a KiwiSaver provider that you think is the best fit for you and join directly by requesting a product disclosure statement and completing an enrolment form.
KiwiSaver is very flexible when you are your own boss - you get to decide with your KiwiSaver provider the contribution percentage. You can pay contributions via lump sum payments or set up a regular payment schedule.
Being self-employed you still enjoy all the benefits of KiwiSaver except for employer contributions. You may even be eligible for an annual government tax credit.