I'm trying to connect my Re450 range extender to my Frontier NVG443B router using the tether app, but it doesn't show up. I'm following the instructions that came with the range extender and it doesn't seem to be working. I plugged the extender into a wall outlet right near the router, waited for the power light to be a solid color, and then followed the steps in the app up until the point where your supposed to connect it to the router, but like I said it just doesn't show up at all, and I don't understand why.