iCloud - iOS Programming: The Big Nerd Ranch Guide - page 855

Now that this device has the new provisioning profile, it can run applications that have
been signed with it. Repeat these steps for any device that you plan to run Nerdfeed on.
Time to sign your application. Select the Nerdfeed project from the project navigator and
then select the Nerdfeed target. In the Build Settings tab, locate the Code Signing Identity
field. Change this property to the Nerdfeed provisioning profile ( Figure 30.7 ) . The
Nerdfeed application is now signed with the Nerdfeed provisioning profile.
Figure 30.7 Changing an application's provisioning profile