Once you're in the Bluetooth settings, select Add device (or the closest equivalent). Your headphones/earbuds should appear there. Select them, and the TV should indicate that the headphones are now ...
Connecting your smart TV to Ethernet is the best decision you can make.
To forget a network with a changed password, connect to it first by adding it manually. Forget unused networks to prevent accidental automatic connections. This article explains how to forget a Wi-Fi ...