You do not receive a checkbook with your Qapital Spending account but you can write a check in app and a third party provider will mail it for you.
Go to the 'Transfers' tab, tap on the 'Pay Bills' button and tap on 'New Check.' You will then need to either create a new check recipient or choose from the list of existing check recipients.
The check will arrive to the recipient in 4 to 6 business days.