How can I outlaw the office of president?
You can't outlaw it, but you can change who holds office
Considering the office is part of our constitution I don't think you can.
For the US? You would have to change the Constitution, specifically the Article II. Good luck with that.
It's impossible unless the Constitution is changed, but I seriously doubt that.
Somehow manage to become a dictator with absolute power.
Bored again?You couldn't unless, once again, you were to over throw the entire government and such. :o
You would have to make a change to the constitution. The constitution itself specifies how changes can be made. You question implies that you have not read the constitution yourself. I would start there.