hi refer this link of test fight this may help you it with screen shot refer this link http://help.testflightapp.com/customer/portal/articles/494413-how-to-create-an-ipa-xcode-4-3-
before start this install profile in keychain by double click on it and same way you need to install .p12 in keychain.than start from 3 step from link hope this may help you.