Janie, Since you have already quilted this runner, you might want to watch this video as I think this is what you probably can do at this point. It looks fairly straightforward although a bit tedious but since your piece is a table runner and therefore not too big, it might work for you. Good luck with your very cheery runner! I could have used that on my table in February when it was so dreary.
http://quilting.wonderhowto.com/how-...-edges-232952/