Where did you get the recipe? Is that all the info it gave? What kind of beer are you trying to make?
Assuming it is a 60 minute boil (I've never used Coopers cans), then one of the hops will go in at the beginning of that 60 minute boil, and the other one towards the end of the boil. The first hop addition is for the bitterness, later additions are for flavor and aroma. But would need to know your goal to give you more info.
Tried to keep up with this signature, but just couldn't.