IOS Launch Failed

I’ve problem launching to Iphone 6 from the iMac. In UE4, the log says “Make sure your device has been enabled for development from within the Xcode Devices window”, I’m not sure how do you enable it.

I’ve followed the steps on the ios quickstart link:

Currently, there’s error launching it from UE4, but I can manually open it through the Iphone without problem.
Any ideas on solving this?

Anyone help?I’m experiencing the same issue too!