Nah, didn't fuck it up, you're OK :thumbsup:

You want to try and bend it so that light gets to the bottom nodes. Your plant is still pretty small, so wait a few days and tie it down again, and try to get it tied down so that the top growth tip is parallel to the ground. Wait a few days again, and tie the top tip down again so it's parallel again. Once you do this a few times, the lower shoots will become the tallest. Then tie them down. Keep going until you are satisfied that the growth tips are all at the same level.

It will take a few weeks. I find that LST is easiest about 6 hours after a good watering.