If you already have an Apple ID, tap the Sign In With An Apple ID button and enter your username (usually your email address) and password. Apple then spends a few moments linking your device to your Apple ID. If you don’t have an Apple ID, it’s easy enough to create one by tapping the Create A Free Apple ID button. You then enter your birthday, name, and email address (or you can create a new iCloud email address), as well as a password, a security question (in case you forget your password), and whether you’d like to receive email updates from Apple.
And if you’d rather not set up an Apple ID, you can tap the Skip This Step button in the lower right corner. You can always add or create an ID from the Settings app later, but note that you won’t be able to buy anything on the iTunes Store or set up iCloud until you do.
Set up iCloud: If you’ve chosen to set up or register an Apple ID, you can also enable iCloud on your device. iCloud is an umbrella term for Apple’s collection of sync services, which allow you to sync your photos, apps, contacts, calendars, and mail across multiple devices.
Choose to set up iCloud, and you’ll first be asked whether you’d like to enable iCloud backups for your device. If you do so, you can have your device back up all essential settings to your iCloud account; if you ever need to restore, you can do so over Wi-Fi without needing a computer. (Of course, if you’d rather back up to your computer, you can always elect to have iTunes back up your device.)
Additionally, you’ll be asked whether you’d like to opt in to iCloud’s Find My iPhone service. This enables location monitoring for your device, allowing you to find it using your Apple ID and the Find My iPhone app should it go missing.
If you have a device that can use Siri, Apple’s new personal voice assistant, you’ll also be asked if you want to use it. You can toggle Siri on or off from this initial setup screen, but you can always change your preferences from the Settings app at a later date.
Once you finish the setup process, you see a screen asking if your device can automatically send diagnostic and usage information to Apple to “help Apple improve its products and services.” Choose Automatically Send or Don’t Send, and then tap Next, and you see the aforementioned Start Using device screen. Congratulations! You’re ready to begin using iOS 6.