Hemming is easy when you have an iron. At the bottom end of your skirt, fold in about 3 and iron flat, all the way around. At the top end of your skirt, fold in about 2 and iron flat all the way around. While you are ironing the top, make sure that the top hem extends at least a ½ past the drawstring holes. If a 2 hem isnt enough to fold over the holes, try folding a bit more and then re-ironing.
Your panels should still be inside-out. With a needle & thread or a sewing machine, start to stitch all the way around the bottom of the skirt, just about 1/8 from the top of the hem. Do the same with the top hem, but be careful not to sew through your drawstring holes.
When your skirt is sewn, you will be ready to thread the ribbon drawstring.
(Need help? Ask in the forum.)