Nikkaypoo:
As I think you understand, you flashed the international ROM to a North American phone. I'm actually kind of amazed that the phone powers up at all. That's a good thing, though, because it means you have a chance of recovering the device. You do NOT want to try to follow the instructions in the link you posted.
First thing to test: Can you boot into download mode or recovery? Power the phone off completely. Pull the battery if necessary, then reinsert it. For download mode, hold the volume DOWN, home and power buttons down at the same time. When you get to a warning screen, release all three buttons, then push volume up. You should see a message warning you not to disconnect the phone or power off. For now you can ignore that. Pull the battery out to power down.
For recovery mode, with the phone off, press and hold volume UP, home and power. When you see the Samsung logo, release all three buttons.
Let us know what happens when you try these.