To change the station in the PBS app on your Roku device, follow the steps below.
Open the PBS Video channel on your Roku device.
Scroll down the menu options on the left side and select Profile.
Within the Profile menu, select Change Station.
Using your remote, select a default station from the right list, or enter the zip code of the new station.
A list of available options appears on the right. Scroll over and select the station you want.
The new station is reflected along the top of the screen of the PBS Video channel.