How do you properly play fretboard diagrams ?

I got a guitar book for how to play scales and it has these diagrams that I don't properly understand how to play them correctly.I'm new to guitar so I don't know much about ''root of a scale'' here's what the book says http://i451.photobucket.com/albums/qq240/Tacopillard/teb.jpg but I don't quite understand how am I suppose to play it? here's some other examples http://0.tqn.com/d/create/1/0/o/w/A/-/lyd1.jpg