Hi I'm new to knitting myself, so I really don't know how to explain that last stitch. Maybe this Youtube video will be of help to you. It shows how to finish that last stitch. Maybe this will help you until one of the other more experienced KH can explain it for you. . click on the link below. I hope it works for you Good Luck!
What Eccie said. That's the way. It helps to stick the end through the loop a copuple of times, making a rolling hitch, before you pull it up. If you're using stuff that doesn't felt, that keps keep it from pulling out. If you're felting, of course, it's going to weld itself in place anyway.
I've also been known to use a drop of flex and stretch fabric glue on that last bind-off stitch in places like armpits that might get a lot of stress.