How add God Cards to Yu-Gi-Oh Power of Chaos

You can't because God cards don't have the effects on them so it is unclear and they aren't even official cards because they aren't allowed in tournaments. They have a different color backside and don't even have the Yugioh logo on the back or a code to input it into games.

However, you can get Exodia if you have Yugi The Destiny. If you want an easier way to win with Exodia, make a deck with defense cards and cards like pot of greed, graceful charity, and if you have Kaiba the Revenge, sangan and Witch of the black forest, monster reborn, premature burial, and shallow grave so you can draw a piece when they die and reborn the witch and sangan so you can draw more pieces! Also get bigeye so you can arrange the order of the top 5 cards of your deck.

Also in the Kaiba The Revenge, there are 5 cards that spell FINAL, and if you have all 5 of them in order then you automtically win. I think this is easier to to win with than exodia because as long as you draw a destiny board (F) then just activate it in ur bottom left card slot and in 4 turns you will win if you can keep them alive.
If you want to do this put 3 destiny boards (F) in your deck and only have one I, N,A, and L and get defensive cards and cards to draw more cards. Bigeye will also help here too.