Actually that is a very good question.At that point you are as high as you are going and you don't want to fall from there!!!!
I always place my last step at the same level or higher ,then the stand platform... It is safer and easier . You may want to buy some screw in steps if you want to get higher.Place them first if you want then you can take the last three out when you are done hunting. and it makes it difficult(not impossible) for someone to steal or use your stand!!!
I remove the bottom 3 steps and place a small twig in the holes so I can find them in the dark...I always carry three steps in my cargo pockets.