This steps will help you to change the banner name of Oracle Fusion ERP Application, banner helps to identify whether it is production or test environment.
Below screen shows the banner message before changes made

Step1: Navigator -> Setup and Maintenance

Step2: Click on Right side menu bar and click on Search

Step3: Search for profile ‘Manage Administrator Profile Values’

Step4: Select option ‘ Manage Administrator Profile Values ‘ from search list

Step5: Search for ‘FND_BANNER_MESSAGE’ under profile display name field

Step6: Select ‘FND_BANNER_MESSAGE’ option from search result

Step7: Under ‘FND_BANNER_MESSAGE’ profile values you can change the banner name

Step8: Once changes made click on ‘Save and Close’ button from right top side

Step9: Banner message changes reflecting instantly on the screen
