You do not receive a checkbook with your Qapital Spending account, but you can write a check in the 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.