Samsung Galaxy Tab S User Manual page 137

Change User Account
Nicknames and Photo IDs
The photo and name each user uses in their personal
Contact entry (listed under Me at the top of their
Contacts list) is used as their User ID and name.
To change their ID photo and name, each user can
edit their personal Contact entry. For more information,
see "Edit a Contact" on page 60.
Settings 129
Users