I just purchased this router as a replacement and I am unable to find the location to change the channel for either the 2.4ghz or 5ghz channels. The searches I've done show that the setting should be under Advanced>Wireless>Wireless Settings, but there is no option to change the channel there. The 5ghz options are also not availble to change as I would expect them to be from my experience with other routers. Is there something I am missing or a different place I should look to change the channel width?