How to re set up direct debit as had cancelled in December I want to carry on now now with the app. 2)?can I have the app on two devices from the same quickbook account

Hi Katiemetcalfe18, 

When you sign into you account it will ask you to put your billing details in once they are in you can set up the direct debits for the account. You can have the app on multi-able devices as you just log on with your Quickbooks credentials.