Where do I sign up for Flex? December 18, 2020 21:18 Updated Download the app on Google Play or the App Store! Related articles I’m not sure if I completed signing up, how do I know? What banks does Flex work with? What is an online rent portal? Do I have to use the app? How do I reactivate my account for the upcoming month? Comments 0 comments Please sign in to leave a comment.