Your G300 can work as both your main Wi-Fi router and also along with your Wi-Fi router. If you'll be using it as your main Wi-Fi router, the unit will usually be connected directly to your broadband modem or home network through a physical wire connection. This connection is ideal, but sometimes you may want or need to position your G300 in a part of the house where a wire is impossible.
If you already have another Wi-Fi router in the home, you can make your G300 operate in "client mode." This means that instead of your G300 providing Wi-Fi to other devices, the G300 instead gets access to the Internet from your existing Wi-Fi router.
In the Dashboard, click Setup and then Net & Wi-Fi:
You will be presented with an option to use your G300 "Through A Wi-Fi Access Point." Then you'll need to scan your network so the G300 and your existing Wi-Fi router can recognize each other.
Important Note: When your G300 is in Client Mode, there must be no physical cables connected to it (other than power). Unplug any cables from the G300 out to any broadband router you may have connected it to, and unplug any cables from other devices that are physically plugged in to the ports on the back of the G300. These cables can cause confusion in your home network. If you're going to use client mode, think of your G300 as just another Wi-Fi device that shouldn't be plugged into anything besides the wall.