Myndstream can be easily connected to your Sonos speaker system either by connecting your phone, tablet or computer to the Sonos speaker using an Aux cord to the Line-In port, using Bluetooth or using Airplay.
Sonos has a guide for Bluetooth here - https://support.sonos.com/en-gb/article/use-bluetooth-on-sonos
Sonos has a guide for AirPlay here - https://support.sonos.com/en-gb/article/stream-airplay-audio-to-sonos
Sonos has a guide for Line-In here - https://support.sonos.com/en-gb/article/use-line-in-on-sonos
Once you have connected to a Sonos speaker you can group other speakers to play Myndstream on multiple Sonos speakers.
There is a guide for Bluetooth here - https://support.sonos.com/en-gb/article/share-bluetooth-audio-with-your-sonos-system