Use the SAMSUNG remote (not the one you may have for a tv provider - such as Xfinity) and tap the MENU button. That should bring up all your television settings/options.
Go to NETWORK and review the options, there should be an option for NETWORK SETTINGS (or similar) then you can see the options you can play with to connect to WiFi.
Sometimes just turning the TV off and on resets a connection but apparently that hasn’t happened in your case.
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