How do I link my Alliant account to Cash App? On the Cash App website: Log in to your Cash App account. Go to the “Banking” tab. Select “Link Bank” and follow the prompts to link your Alliant account. On the Cash App app: Open the Cash App and log in. Tap the Profile Icon on the home screen. Select “Linked Banks." Tap “Link Bank” and follow the prompts to link your Alliant account. For more information visit the Cash App website.