To manage your Super Suite billing click on the Super Suite icon in the main bar on the left of the screen, and under the Subscription part of the app click Manage subscription at the top right like this: 

This will bring up a popup modal screen. 

Here you can:

a) Update your plan

b) Change payment method

c) Update the billing information shown on invoices

d) Download previous invoices

e) Cancelling your Super Suite plan: 

Please email support@sweethawk.com requesting cancellation. 

With this email please specify if you would like to cancel ONLY the Super Suite and wish to continue using all (or some) of your installed SweetHawk apps on as part of the 'pick and choose' billing option, OR, if you would like to cancel the Super Suite AND cancel billing for SweetHawk apps across the board.