Since this is the beginners forum, I'll 'splain terminology to the OP. For the rest of you experienced brewers, turn away. Nothing to see here.
When we describe the hops schedule, we usually say something like "1 oz cascade 60 minutes, 1.5 oz fuggles 15 minutes" what that means is:
once the wort reaches 212F and begins to boil, add 1.5 oz of cascade and set the timer for 60 minutes. When there are 15 minutes remaining on the timer, add 1.5 oz of fuggles. Understanding the terminology and using it consistently will help you explain what you have done and help you get better advice here.
there are usually 1 to 3 hops additions in a boil. The first is added for 60 minutes and provides the bitterness that balances out the sweetness of the wort. The second is 15 minutes for flavor and is where you use your "expensive" or " noble" hops. The third is for aroma, and usually goes for 5 minutes, or even at flameout. Aroma is the first beer sense that greets your brain as you raise the glass to your lips.
Bittering additions are done for 60 minutes because beyond that time, few alpha acids remain. They have been for the most part been disolved into the beer. Any hop can contribute bitterness, aroma or flavor. Its up to you to decide. The recipie is designed to have a certain level of bitterness. By adding first your (incorrect) flavor hops and then your (correct) bittering hops, you have turned them all into bittering hops. For future reference, if I were to add the wrong hops at 6o minutes, i'd probably leave it alone and use the bittering hops for flavor and see where it goes. You might even like it better. Just remember as you're drinking this beer in 60 days or so: this is more bitter than the recpie called for. Remember to record what you were SUPPOSED to do and what you ACTUALLY DID on your brew sheet. It really sucks when you make a mistake, LIKE it and then can't do it again.