If you forget your passcode, help is available. If you tap Install Tonight, connect your device to a power cord at night and your device will update automatically by morning. Or tap Later and choose Install Tonight or Remind Me Later.
Tap the configuration profile in Mail and follow the installation instructions. On your Mac or PC: Save the file to your hard disk and email it to an account on your iPhone. On your iOS device: Download the configuration profile directly onto your iOS device and follow the installation instructions. Download the configuration profile from the download page.IOS Beta Software Installation Using the Configuration Profile