I can’t tell what they look like from the other end but if it’s the type with metal wire that points in two different directions then it’s easy. Squeeze metal together to remove from holes and find the right size for your shoe. Doubt the holes are marked with sizes so it’s just trial and error. Find the right hole so that it fits snug in the shoe.

If you just want to see the instructions I found a similar one on amazon just scroll through the pictures.