I am pretty certain the 6 affixes = the primary and secondary skills listed in blue that you are referring to.
When a regular item drops in game those blue skills are randomly generated. When you create the same item in the editor you are controlling (as much as possible) the blue skills and the range at which those blue skills randomly generate.
If you want to create the standard item you see on the blizzard diablo page, then create the item with the same affixes listed on the blizzard page. It will be difficult to get the exact number, but you can choose a range where the desired number appears.
When a regular item drops in game those blue skills are randomly generated. When you create the same item in the editor you are controlling (as much as possible) the blue skills and the range at which those blue skills randomly generate.
If you want to create the standard item you see on the blizzard diablo page, then create the item with the same affixes listed on the blizzard page. It will be difficult to get the exact number, but you can choose a range where the desired number appears.