How do I add my new wifi network onto R6230 router

What modem/gateway is the R6230 connected to? 

It should be hardwired to that modem/gateway. 

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Karjiana wrote:
I just switched ISPs and just set up the modem and can't add the new Wi-Fi information onto my existing Nighthawk app.

Does anyone know what I'm supposed to do?

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When you change ISPs, you need to get your devices to forget any settings from the old ISP. The easiest way to do that is to reset the router and set it up from scratch.

How do I perform a factory reset on my NETGEAR router? | Answer | NETGEAR Support

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Karjiana wrote:
I just switched ISPs and just set up the modem and can't add the new Wi-Fi information onto my existing Nighthawk app.

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If the ISP's modem has wifi information, it isn't a modem. It is a modem/router. That can cause problems which is why plemans asked for more details.

If you are introducing a router to a new modem, you need to get the router to connect to the new ISP service by entering the login details for the new service.

There are a few options.

You can reset the router and take it through the setup process.

How do I perform a factory reset on my NETGEAR router? | Answer | NETGEAR Support

You can then set the wifi details by following this:

How do I change my NETGEAR router password or network name (SSID)? | Answer | NETGEAR Support

If you don't want to wipe out all the settings on the router, such as the wifi SSID and password, you can use a web browser and the graphical user interface (GUI) and tell the router to run the Internet Setup Wizard.

For more details, check the manual for your device.

Visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware.

Look for the model number on the label on the device.