https://www.etsy.com/listing/1160285..._profile&sts=1

I bought some length of black cord to add to the edges, but not sure how to add them; does anyone have any tips? I've never had a garment with piping on edges before. From what I've seen there's a type that's a cord with insertion braid inserted into the edges of the fabric, which this isn’t, & the flap type that wraps around both edges, which this is?

Thank you.