A swiping motion on the page will flip the page. A swiping motion going to the right, will flip the page to the previous page. A swipe towards the left will flip the book to the next page.
To capture a screenshot of the page, you can either tap both the upper left hand portion and the lower left-hand portions, at the same time. The screen shot will also work for a tap on the upper left-hand corner and the lower right hand corner of the Kindle Paper White. The screenshot will be uploaded to your PC the next time the Kindle is connected to the PC. You can use the screen shot to send an image of the page to another person via email. You can also edit the page on any photo or image-editing software to highlight sentences or quotes.