Have you charged your headphones fully? That would be the most important thing to begin with.
The headphones will usually come with a charging cable.
After they have enough power from charging, you need to 'pair' the headphones with a bluetooth enabled television or a bluetooth enabled device such as your phone.
You can do this in the settings of your phone or television.
_________________
“I was ashamed of myself when I realized life was a costume party and I attended with my real face” - Franz Kafka