Enchantress at round 72 with Mass serpent ward, bad juju and Multicast Dota 2 Custom Hero Chaos 

If you mean by that change the ability, you need to buy the blue book called "book of retraining" with 2900 gold from shop and chose the ability you wish to change, check where is it at 4:24

@@MR29899 nope, I mean at 6:45, you put your skill Mass Serpent Wards from E to Q, how can we do that in game?

@@tong.tranquang Oh sorry my bad, so you need to click on setting at the top left then drag the ability that you wish to change it's place then replace it with another one, it's ez you will know

@@MR29899 yah, thanks for sharing