Yes. You are not required to have a recurring deposit from your payroll, and can instead make a recurring or one-time deposit from a bank account or credit card.
To turn off your payroll deduction, click the "Recurring Deposit" field on the left-hand sidebar menu and then click "Cancel Deposit".
To switch to a recurring deposit from a bank or card instead, click the "Recurring Deposit" field on the left-hand sidebar menu, then click "New Payment Methods" and choose your preferred method. You can also click "Add Payment Method" to add a new card or bank.