Signing Error


I am trying to follow the steps here:

to get started on Muse App development using iOS. When I try to select my team from the combo box, I get the following error:

“Failed to create provisioning profile.
The app ID “com.choosemuse.MuseStatsIos” cannot be registered to your development team. Change your bundle identifier to a unique string to try again.”

When I change my bundle identifier to a new a string, I get this error:
“There are no devices registered in your account on the developer website. Plug in and select a device to have Xcode register it.”

Any suggestions as to how to resolve this problem?