Once inside the accessibility settings or help menus, the goal is to open a web browser. This is where the "GSM Link" comes into play. You might need to type a URL or scan a code (using Samsung's "Scan" feature on the setup screen) to open a specific webpage.
If you have a device that is FRP-locked and has lost its GSM connection (no signal), here is a typical workflow using FRP Neo. frp neo gsm link