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Try resetting the DNS-345 to the factory default settings. While the DNS-345 is powered-up, press and hold the reset button on the rear of the unit for > 9 seconds.
Oh, it's the OLED that was flashing...I'm going to assume this DNS-345 is fresh out-of-the-box and not yet configured. Enter the DNS-345 IP address into an Internet browser on your LAN. You can configure your DNS-345 after logging into the web UI (username: admin; password: [blank])
Log into your router and look at the network device table. The DNS-345 will be listed there.
Keep the DNS-345 connected your router; log into your router web UI and look for the device in the network table; and transcribe the IP address into a new browser window.
I don't have a wi-fi routers (its a SOHO) so I connected it to one of the routers and scanned the network - there is no new device...