How to get a work permit for a New Zealand guardian accompanying visa?

The Guardian of New Zealand obtained a visa work permit:

If you have a guardian visa, you cannot apply for a student visa or a general or special purpose work visa. If you want to take part-time jobs or take part-time courses, you can apply to change your visa conditions to take part-time courses or take part-time jobs. You can only go to work from 9:30 am to 2:30 pm from Monday to Friday, and you must have a job.