Sony PEG-S300 - Manual (Page 116)

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From the dropdown list in the upper right corner, select Owner.
4
Enter the owner information.
If you enter more text than can fit on one screen, a scroll bar appears at
the right side of the screen.
In case you assigned the password using the security
application
If you use the security application to assign a password, to enter/edit the
owner information, you have to unlock the Owner Preferences screen to
change the information.
1
Tap icon.
The Application Launcher starts up.
2
Select System from the dropdown list in the upper right
corner.
The System screen appears.