To update your station's stream URL, follow the instructions here: Update your station at TuneIn
If your station is not yet on TuneIn, then you can add it with TuneIn On Air.
Here's the full announcement with pricing and lots of large and impressive marketing words like empower and commitment.
It's pricey at $249 "per quarter" (i.e. $996/year or $83/month) — but maybe worth it, especially, if you want your station to be available on Sonos and other home devices.
They also have lower-cost pricing for "educational and non-profit broadcasters". If your station gets the discounted rate let us know what it is? We're... curious.