Beginner at crocheting?

You double crochet the next two stitches together, then do the same for the next two stitches, and again for the next two stitches. ( To do that you yo, insert hook in first st, yo, pull loop up, yo pull loop through first two loops that's on your hook, then yo, insert hook in next st, yo, pull up loop, yo, pull through all loops on hook.) Then repeat this over the next two stitches until you have made 3 decreases. When you work the other 6 ch, it's the same thing... you'll be making a total of 3 decreases over those 6 chains.