Steps:
1. Prepare an ethernet cable.
2. Find the LAN port on the TV
Generally, the LAN port is on the side or bottom of the back of the TV. If you can't confirm the exact location of the LAN, please refer to the Terminal Connections in the user manual.
3. Insert the cable into the TV Lan port, then the TV will recognize it automatically.
You can also refer to Youtube-Video: How to connect realme TV to Internet with Ethernet Cable