Nikon D7200 body - Manual (Page 283)

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6
Enter a password.
Enter a password and select Save.
Passwords may be from 8 to 63
characters long.
7
Enable wireless security.
Select
b. A confirmation dialog will be displayed; select OK.
A Viewing Wireless Security Settings
To view the current password and authentication/encryption settings,
select Current settings in the Wireless Mobile Adapter settings
menu.