You'll need to notify your employer directly if you wish to increase or decrease your KiwiSaver contribution amount.
You are able to choose the amount that you contribute from your pay towards KiwiSaver. You can choose to contribute 3%, 4%, 6%, 8% or 10% of your pay.
The default rate is 3% if you don't choose a higher rate.
You are able to change your contribution rate once every 3 months. You'll need to do this by notifying your employer, generally by either completing a KiwiSaver deduction form or via an email/letter.
Read more about how to change your contribution rate on the Inland Revenue website.