Please follow Apple's instructions for Ad Hoc Distribution:
https://developer.apple.com/library/ios/documentation/IDEs/Conceptual/AppDistributionGuide/TestingYouriOSApp/TestingYouriOSApp.html
Quick Rundown
To distribute your app for beta testing:
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Optionally, create an iTunes Connect app record.
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Register all test devices.
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Create a distribution certificate.
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Create an ad hoc provisioning profile.
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Update the build string.
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Archive and validate your app.
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Create an iOS App Store Package.
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Install the app on test devices.
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Distribute your app to testers.
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Solicit crash reports from testers.
