Tap at the top of the screen and the menu will have, among other things, a home icon all the way to the left.
Strongly recommend your friend review the Kindle user's guide which come pre-downloaded on each device. It'll have these sorts of basic things.
If for some reason he/she has deleted it from the device, it should still be available in the Cloud to be re-downloaded.
There's also considerable help available on Amazon: http://www.amazon.com/gp/help/customer/display.html/ref=hp_200953940_pw_landing?nodeId=200953940
Strongly recommend your friend review the Kindle user's guide which come pre-downloaded on each device. It'll have these sorts of basic things.
If for some reason he/she has deleted it from the device, it should still be available in the Cloud to be re-downloaded.There's also considerable help available on Amazon: http://www.amazon.com/gp/help/customer/display.html/ref=hp_200953940_pw_landing?nodeId=200953940
