Hi, this is the first time I've had an android phone, my new nexus 6. For the life of me I cannot figure out how to undo. I have googled it and I've seen in places, mainly older websites / posts, that say there is no on do in android. But that doesn't make sense. How do I undo? On my former iphones it was simply shaking the phone. I can't find it in any of the menus. Sorry if this is a totally newbie question. Thanks.