How do I make a label for a handmade quilt that is already completed?

Obviously, this is my first quilt. I thought the label was the last step, but now I am reading that you should sew it onto the backing before you quilt! Oops! I don't have a printer, so I don't want to attempt a computer printed label. I have tried embroidering the label, but it doesn't look too good, so I was wondering if handwriting with a Sharpie marker would work, or would it run or fade with washing? I need solutions fast, I made the quilt for my baby and she is due anytime. So something quick and easy to do would be best. Any advice appreciated!!!