Do you have device that UUID you've tring to add 'in hand' ? If so go to your organizer, and click "use for development" button.
If you don't have that device, you have to create Distribution (AdHoc) provisioning profile, and add that UUID there.
Question
As the title says, I am trying to add a device to a provisioning profile that is being managed by Xcode 5.
I added the UUID on the dev website, but I am unable edit the provisioning profile itself. Is there any way of adding the device other than creating a new provisioning profile that is not managed by xcode? Thanks in advance.
Solution
Do you have device that UUID you've tring to add 'in hand' ? If so go to your organizer, and click "use for development" button.
If you don't have that device, you have to create Distribution (AdHoc) provisioning profile, and add that UUID there.