Edge help?

i just got a dakine edge sharpener, the green one that holds a stone to sharpen the edges. how do i use it? also whats the difference between the two sides, one has only straight grooves and the other has grooves going in both directions?
 
what the fuck triple post??? w/e start sharpening 2inches in front of the binding and 2 inches behind the binding leave everything else dull
 
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