How do I change initials for team members on POS

[Pinball]

We have 2 team members with the same initials sharing square register.  How can I change initials for each team member

[VanKalkerFarms]

I don't believe that there is a way to change them.   Maybe by giving them a team member ID in their personal information would use that instead of the initials.  Unless this is a different feature only in Square Register.  @Lovewell , @lenjobakes