For more information about Last.FM visit Last.FM home page. To listen to your Last.FM radio stations read Sonos Forum Post, someday I hope to integrate this.

Currently each Last.FM account can either have a single zone or all zones assigned to it at one time. Someday I make it so you can pick and choose what zones are assigned to which account. Only single zones or multizone coordinators can be selected. Remember to hit Update after changing account to zone mapping.

UserZoneAction
Delete

Add a new account. To create a new account first visit Last.FM home page