Yes. You can continue to use Flex as long as you reschedule all missed payments and have no outstanding balance at the end of the month. You can reschedule your second payment of each month on the Flex app or send a reschedule request to the Flex team HERE.
NOTE: You must pay your total due in full each month, or you will be unable to access the Flex line of credit to pay your rent the following month. Flex reports your payment history to TransUnion and late or missed payments may have an adverse impact on your credit score.