A:AnswerIf you check the FAQs, you'll see the answer is 'yes'. I've done it myself and had absolutely no problem provided I had my receipt and the item was still in its packaging.
A:AnswerYes you can increase the font in the book, I would recommend using the Kindle Paperwhite tutorial provided with your eReader it walks you thru everything you need to know to use your eReader.
A:AnswerThat is completely normal. I think it does it incase you accidentally tap the screen and the page changes you don't spend two minutes looking for the sentence you were just on.
A:AnswerYes, tap the top left corner of the screen. The menu bar will appear. On the far right of the screen you will see some horizontal bars. Tap the bars. Then slide the airplane mode on. It will automatically disable all wifi until you slide it back off.