To change the station in the PBS app on your Apple TV device, follow the steps below.
Open the PBS app on your Apple TV. Scroll down the menu options on the left side and select Profile.
Within the Profile menu, select Change Station.
Use the number pad along the top of the screen to type in your ZIP code. Stations nearby will appear on the bottom of the screen.
Using your remote, select a default station from the bottom list
Use the select button on your Apple TV remote to confirm.
A list of available options appears on the right. Scroll over and select the station you want.
The PBS app will refresh and the new station will be reflected along the top of the screen of the PBS app.