WHERE IS THE “SAVE” BUTTON?

Once you are done- just press done and then go back using the arrow at the top left of the screen. The file will be saved and you will go to the list of other stored files you may have saved in the past.

Probably a dumb question, but where is "Done" located? I don't see it anywhere.

And why isn't "Save" an option in the toolbar customize function? It seems like such an obvious candidate.

When you’re using Pages, it saves constantly, you don’t have to “Save”. Just tap “Documents” in the upper left when you’re done, and as the page is zooming away, it’s already saved. Even if you’re in the middle of a long passage it’s saving as you add letters. At any time, you can put down you device, let it go to sleep and it can even power down and die… your file is already saved even before you put it down.