Your app is in a Bundle - bundled devices can not change portals.
Please change the portal(s) from your main device.
Check this for more info about app bundles.

Enter 10 digits settiings code or scan QR code from your TV to edit your Portal(s).

You can get the QR code and settings code (in this example 1234567890) by starting the app and waiting for it to load the Portal, see example below.

Or you can press OK/Center key while seeing Loading Portal and get the QR code in the Portals menu, see example below.

Settings code in this example is 1234567890