There are many different ways you can load the development app on your device.
Method 1: iTunes
If you sync your device using iTunes, this is straight-forward. It's basically the same way you add movies or music. Apple's instructions are here:
See the section called "Installing your app on test devices."
Method 2: Xcode
This is the method I use. It works well with any iOS device, even if the device is synced to a different computer.
1. If you have not already done so, install Xcode from the Apple developer site.
2. Attach your device to your computer. On the device, select the trust option if prompted.
3. Launch Xcode, and choose Window > Devices (or press Cmd+Shift+2).
4. Select the device on the left side, and then drag and drop the signed .ipa file into the Xcode window.
There are other methods as well.
Method 3: Diawi.com
The method we use at Bates Creative is fast and easy. DIAWI.com (Development iOS Apps Wireless Installation) is a free service to iOS App developers that allows you to upload and install to your wireless device through wifi!
Go to http://www.DIAWI.com
Drag and Drop your Signed App into the App Drop area
Click Send: This generates a unique URL that you can distribute to everyone on your App Provisions List that you set up on the iOS developer site
Email the link, or retype it into Safari on your mobile device
Click the link... Click install. Launch your app.
Hope this helps!
Agreed that Xcode is fast and easy, but only if you are the only one needing to view your app. Usually, when I create an app, it needs to be previewed by a team (myself, creative director, art director, project manager, and client), so diawi.com is a quick and easy way to get to everyone with one quick and easy link.
I haven't tried iFunbox yet. I'll look into that one! thanks Ivan!