Here are the steps to follow to install this for your Sonos:

- Within the Sonos App, tap the Settings cog.

- Choose Services & Voice.

- Tap Add a Service.

- Scroll down and choose BBC Sounds.

- Tap Add to Sonos then Connect to BBC Sounds, then Authorize.

- You'll be redirected to the sign in with your BBC account through the browser.

- Tap Open once you're signed in.

- Enter a name for your BBC account.

- Tap Done.