Using a fish stringer is fairly simple. If your stringer comes with a needle, use it to pierce a hole on the lower lip of the fish. Run the rope of the stringer through that hole and back through the ring of the stringer. That's all, your fish is secured now! If you still find it a bit confusing, this video may be of help. In case your stringer doesn't come with a needle, you can always use a sharp object to make the hole as well.