Remote Controller
The remote controller is a simple peripheral which can be used to change the URL of a screen from a certain distance, as long as the chunk in which the screen is located is loaded.
Recipe
The item on the first line is a Peripheral Base, which is used to craft all sorts of peripherals.
Usage
Place it somewhere, link it using the Linking Tool, and right-click it to change the URL remotely.
Please note that anyone who uses the remote controller needs the "Change URL" permission: this does not depend on who placed the block.