This FAQ will explain how to update the super rate on your Talent On-Cost Supplier (Superannuation Suppliers). 

By updating your Talent On-Cost supplier, this negates the need to update each of your individual talent suppliers.

These changes normally need to occur at the beginning of the new financial year (ie, in Australia the financial year is from 1st July to the 30th June the following year)

Accounts Payable>Suppliers and add a filter on the Supplier Type column, selecting Talent On Cost
 

 
Open the Superannuation Funds and then click on the Talent Details tab and change the field highlighted in red to the new rate.