How to edit level for which you gain a class ability

[Repairman_Jack]

I am trying to created a custom Archetype, to add the Slayer Warhound Archetype.

I have figured out how to add the Animal Companion, but need help figuring out how to change the 1st level Studied Target... moving it to 2nd level. I have tried removing and adding the Studied Target ability, but that didn't work correctly. And, when I select Modify Ability, I can't figure how where to go from there. What's the best way to do this?