where do I plug in the cable on my new apple tv device?

What is your model Apple TV? Identify your Apple TV model - Apple Support

The available ports may differ a bit by model.

Set up your Apple TV - Apple Support

• “1. Plug it in” has a nice drawing to explain it for the 4K model.

What cable?

What model of Apple TV?

The Cables that connect to an Apple TV fit in only one of the ports the TV has. No way to plug them in anywhere they cannot go.

Can you explain your issue in more detail?