I'm not good enough to help you, but if you posted the part of the instructions that you're having trouble with, maybe someone else could... good luck!

We would need to see the sentence in the directions, and then we could really help you. You decrease in crocheting quite easily. Insert the yarn into the stitch, make a loop and pull it through the stitch. To decrease, insert the yarn into the next stitch, make a loop, and pull it through the stitch. Now make a new loop and pull it through all three loops on your hook.