After the dough has completely passed through the pasta machine, turn the slot down to the next smallest setting and pass the dough through the slot. Continue to do this, making the slot smaller by one each time. Don't try to skip a number, as this will only cause the machine to jam and you'll end up with a mess and no pasta.
As you continue rolling the pasta, your sheet of dough will get longer and longer. Try to gently hold the dough as it exits the pasta machine so it doesn't tear. This is a great time to have an assistant help you.
Continue passing the dough through the machine until it's about an 1/16th of an inch thick.