To complete all these steps, you must be set up as the Agent of you iPhone Developer Portal. I’m also assuming that you paid the subscription fee so that you are allowed access.
Go to http://developer.apple.com/iphone
Log in as yourself. Then click on the iPhone Developer Program Portal link.
1) Get the Development Certificate:
Create the certificate request using the Keychain Access utility on your Mac.
Submit it to the iPhone Developer Program website.
Download the generated certificate.
2) Register your device:
Go to the Devices tab in the Program Portal and register your device.
3) Create the App ID:
Click on the New App ID button.
Enter a description or name for your application.
If this is the first time creating an App ID, leave the bundle seed ID to Generate New.
Put * for the Bundle Identifier.
You will see an ID for the App created under the ID column beside the application name of your choice. Note this alphanumeric string as you will need it for later. For this example, let’s assume the App ID is 123D4EFGHI.
4) Create the Provisioning Profile:
Click on New Profile.
Enter a profile name that you will remember.
Check all the certificates you wish included, including the certificate you created in step 1.
Select the App ID you created in step 3.
Check the devices you wish to install this application on for development purposes.
Download the provisioning profile to your Mac.
5) Install the Development Certificate:
Start Keychain Access on your Mac.
Doubleclick on the login keychain on the top left hand panel, which should also be your default keychain.
Go to the File menu and select Import Items…
Select the Development Certificate downloaded in step 1, and make sure the Destination Keychain is set to login.
To ensure the certificate is correct, view it in the Certificates Category for the login keychain. There should be a widget beside it that when you click on it, a private key should appear below the certificate.
6) Installing the Provisioning Profile:
Start XCode, go to the Window menu item and click on Organizer.
Make sure you are on the Summary tab.
Under the Devices topic, you should see your device if it has been registered properly and is now attached to your Mac.
The summary panel is split into 2 halves: the top half is for your device and the bottom half is called Provisioning.
Click on the + icon in the bottom half and open the provisioning profile downloaded from step 4.
Next, in the iPhone Development topic, there should be a subtopic named Provisioning Profiles.
Click on Provisioning Profiles.
The panel on the right should be divided into 3 sections, with the top section having 2 columns: Name and Expiration Date.
Find the provisioning profile you downloaded in step 4 and drag it into the top section.
7) XCode Project Settings:
Go to Project menu item in XCode and choose Edit Project Settings.
In the settings window, select the Build tab.
Make sure the Base SDK in the Architectures section matches your device.
In Code Signing, go to the Code Signing Identity section and select Any iPhone OS Device.
The value should be the exact same as your Developer certificate’s CN, and should be of the form: iPhone Developer: Firstname Lastname (32SDKRR55I)
Go back to the Project menu and select Edit Active Target.
Click on the Properties tab.
In the Identifier field, make sure it starts with the App ID you created in step 3: for example: 123D4EFGHI.com.apple.samplecode
8) Deploy to the iPhone device
Click on the Build and Go button.