How do I reconnect our smart tv to get internet connection?

Some smart TV's have an option to forget a network, if you have that option, click it and then reconnect and see what happens, failing that, try resetting your WiFi router and factory resetting your smart TV.

Hi, really you do not need to the adapter to connect the smart tv to Wifi, just connect to a Wifi connection or Ethernet connection. https://www.smarttvmanuals.net/samsung/how-to-connect-samsung-smart-tv-to-wifi

Some Smart TV remotes require you to use the keypad to spell out letters, just like on phones. Pressing the "2" button once gives you "A", twice gives you "B", three times gives you "C", pressing the "3" button once gives you "D" and so on. See if that works. If not, you need to connect a keyboard to your Smart TV to enter the information.

change your WiFi security setings in your router from WPA/WPA2 to WEP.

Go back to the Smart TV and reconnect to your network with your selected security key.
It may be less secure but it may be the only setting your tv will recognize.

Adding a smart tv just requires adding an ethernet cable to your internet connection to the ethernet port on the set. The smart services on the set us a broadband internet connection to work.

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Re set wifi and network pasword .

Hi, commonly these TVs use a network cable for connecting to Internet through a router, another TVs are wireless enabled, in this case you need a WiFi router to get Internet in your smart TV. The process is similar as you connect a computer to Internet but the keyboard of your TV is the remote control, some smart TVs can work with standard wireless keyboards and mices to surf Internet as with a computer.

connect this to the wireless network of your router.