First get you a length of rope. I make mine about 7' long.
Make a loop in one end.(Big enough to fit over what ever boot you are wearing)
With spring open turn it untill you can get the eye open with the largest opening.
Put the running end of the rope through the eye closest to your foot.
Run it through the other eye and pull the rope through untill it gets close to your foot.
Take the running end and run it the same way you did the first time.
With the loop around your foot, pull the running end tight untill the spring closes and you can put the spring safety on. With the safety on let the rope go slowly.
Do the same for the other side if you need to.