If the Tablo blue LED remains solid, and doesn't blink for around 1 minute when you power it on, then there's something wrong with the Tablo.
This part is normal.
You must disconnect the ethernet cable from the Tablo for the Tablo to enable its WiFi.
Power off your Tablo.
Disconnect the ethernet cable from your Tablo.
Power on your Tablo.
If your Tablo is working properly, you should see Tablo_XXXX on your network.