You can change the emblem that is displayed on your profile and various rankings.
Emblems can be acquired from events and missions.
■How to Set Emblems
Tap the profile icon in the bottom left corner of the home screen to open your profile.
Tap emblems to display the list of emblems you possess.
The emblem with "Current" displayed on it indicates the emblem you are currently using.
Select the new emblem you want to use, and tap the confirm button to change your emblem.