Logging into Spotify via Sonos


I recently setup sonos for a family member. They were not yet a premium Spotify customer. So we signed them up for a premium account. Spotify you can thank me later for the referral. Once signed up for the premium account we realised we didn't have a device password because it was via Facebook. So we emailed SPotify for the device password. In the meantime because we were eager to get started i logged into my spotfy account via their sonos system. We now have the device password but I can't figure out how to logout of my Spotfy account on their Sonos system and then login using their user details. Please help because now when they use their sytem it pauses my system and vice versa if we are both using Spotfy at the same time because there are too many devices using the same account. It is not practical to check in with each other before we use Spotfiy because I am based in London and they are based in the US and also because we are both paying premium customers. Please help me figure out how to log them out of my account and into their account via Sonos. Thanks 

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