Jim, on the main system menu touch the Setup button on the top/left area of the screen, then touch the button with the WiFi symbol (bottom of the list), select your network, and enter the key. (Note the key is case sensitive).
The update app will work with wifi or with a USB stick. Sounds like the stick you were using either wasn't compatible, or the update package was not properly copied to the stick. You can call our support desk for more help if needed 1-888-200-5129.
Thanks,
Walter