Be patient as millions of other people are trying to update at the same time as you.If the update is available, then tap Download to download the update.
Wait patiently and do not disconnect your device until the update has finished.
Take the time to make sure you’ve got your bases covered in case something goes wrong.
There are two ways to upgrade your i OS device — over-the-air via your device’s wireless connection or by connecting your i OS device to your computer and letting i Tunes do most of the work.
Wait for i Tunes to open and connect to your device.
Click on your device in i Tunes and then click the “Check for Update” button in the Summary pane.