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You can view the PREP tutorials by clicking "Help" at the top of the screen (3rd link from the right), then in the window that pops up, click "Fast Static Versions of the Documentation", and finally scroll about 2/3 of the way down the page to get to PREP Tutorials. Alternatively, you can follow the link http://sagemath.org/doc/prep/.

To run the PREP tutorials as "live" documentation from sagenb.org, it's only slightly trickier: open up the link http://www.sagenb.org/doc/live/prep/index.html. You might then have to log in to sagenb.org. (I can't see a way to get there just by clicking links from the "Help" screen.)