By default your account nickname is set to the license name on your FFL. If you have multiple FFL's and accounts it can be helpful to change the nickname on your account, so you always know what account you're in. Changing your account nickname only changes what is displayed on your accounts page and at the top of FastBound.
Changing the nickname does not effect what is displayed on your Bound Book.
To change your account nickname
Click Settings on the Main Menu
Click on the Account Tab if you're not on it
Make changes to the Nickname field
Click the 'Save' button