The strap I had was made to go on loops like these. I just unhooked the one that came with my strap and put the new one on it. It your strap doesn't have a clasp that is made to open then you probably can't use it with your strap. But if your strap has a loop on it just do it the same as the other end was done.
I have to assume you want to use the Mini-Loop to provide extra stability for your camera. In order to attach the female section of the Mini-Loop to the sling-strap, you will need to physically attach it using the loop attached to that section.
I detached (unclipped) the male/female part, attached the loop to my camera; then (clipped) on my sling. the directions given were HORRIBLE that were given, I found a video on Youtube which also helped me. I hope my answer helps.