From the You section (upper-right), tap the account name.
To edit a different account than the one listed, you must switch to the account by doing the following:
Select the appropriate user name from the Users and profiles section.
The device logs out of the current user account and into the selected account.
From a Home screen, swipe up or down from the center of the display to access the apps screen then navigate: Settings > Accounts (left pane) > Users (right pane).
From the 'You' section (upper-right), tap the account name.
Edit the name.
To edit a restricted access user account:
Restricted access accounts can only be edited by the Owner account (the first account used to access the device).
Ensure that you are logged into the Owner account.
If necessary, swipe up or down from the center of a Home screen then navigate: Settings > Accounts (left pane) > Users (right pane) then select the Owner account.
If necessary, navigate back to the Users screen then tap the Settings icon located to the right of the account name.
From the Application/content restrictions section, configure the restrictions as desired.
Turn on to allow access to an app or turn off to restrict access.