with the edge selected use the Chamfer tool to sharpen the edge.(figure 6 & 7)
In the Top viewport select the edges as shown in (figure 8 and then goto Modify Panel>Selection>Loop.
Then deselect the top edges.(figure9)
Then use the chamfer tool again to get the above result. (figure 10)
Then switch to vertex mode and select the top 8 vertex and move up a bit and scale in order.(figure 11)
After all switch to edge mode then select the illustrated edges. (figure 12)
Then chamfer it again. (figure 13)

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