Release UE4 development demo to IOS, encounter problems, ask for guidance!

According to IOS quick introduction, the relevant Settings are set up to UE4. After the Mobile service Provision in the UE4 project setting, the status display: No Valid Certificate Found, has there been a great god knows how to solve?Later, I regenerated a file with IPhonePackager, and another problem was that I would make a mistake when I ordered Import a certificate to load key.Ask the big brother to tell the solution!