Download and install the iPhone Configuration Utility from Apple.
You can get it for mac or windows here (look for "iPhone Configuration Utility")
http://www.apple.com/support/iphone/enterprise/
Here's some basic steps on how to use it:
To install an app using iPCU:
- Connect your iPhone/iPod to your computer via USB cable.
- Close iTunes, if it is open, before launching iPCU
- Launch iPCU. You should see your device appear in the “Devices” section on the left side of the window.
- (I didn't have to do this step... i think you can skip it if you've ever installed anything to your device before.) Add the provisioning profile (mobile provision) to the iPCU Library: Click on “Provisioning Profiles”, then drag the .mobileprovision file into the Provisioning Profiles pane.
- Add the application to the iPCU Library: Click on “Applications”, then drag the app into the Applications Pane. On Windows, the app will be a folder, named something like YourAppName.app. On Mac OS X, the app will be a single application file.
- Access your device: Click on your device in the list of devices on the left. You should see five tabs appear in the main window: “Summary”, “Configuration Profiles”, “Provisioning Profiles”, “Applications”, and “Console”.
- (I didn't have to do this step) Install the Provisioning Profile: Click on the “Provisioning Profiles” tab of your device. You should see your Ad Hoc Provisioning Profile in the list of profiles. In the “Install” column you should see either a button that says “Install” or a button that says “Remove” (if you’ve installed this profile previously).
- Install the app: Click on your device’s “Applications” tab. You should see your app in the list of applications. In the “Install” column you should see either a button that says “Install” or a button that says “Uninstall” (if you’ve already installed the app).
- If you've installed this app before, just click the button named "uninstall" then "install" to reinstall the app.
- If not, then just click the button named "install".
