How do I change my Alliant username? It’s easy to change your username in online banking: Log in to Alliant Online Banking. Click My Profile & Settings at the top of the screen. Click Access & Security. Click Change Username. Type in your new username and click on the Check Availability link to see if the username is available. If it’s available, you’ll type in your password and click Submit. We recommend you create a username that you do not use on any other website. We also recommend that you change your password.