As your existing network has been set with the High Security Level 1 configuration, adding a product is simply Plug & Play. No action is required on the product. Just plug in the new powerline product and it will be automatically added to the network.
Typically, powerline adapters are paired by sets of two or three, so if you need to add additional powerline products to your network that is configured with high security level 1, you must follow the steps below