i need someones insight on how, and what to do in order to create waypoint custom challenges for halo 4 , i mean it says you can but i just cant figure it out pleas and help would be nice.
Same here. I wish to know how 
i did not know you could, i know you can for Halo Reach you get no in game info that they are activated. once you start playing and killing enemies or what ever you set up Waypoint tracks it and you get your credits when you finish, I think that system was created because most people are moving on to Halo 4 and they wanted to give people a reason to still play it. are you sure that part 4 has this feature yet?
From everything I have read throughout the internet, it would seem as though we are going to have to wait till they update the app on our smartphones and update the website to get Custom Challenges. No ETA as of yet.