I’m struggling with the same issue at work. I can’t see the SSID of a given network. I do have my home network, which shows under “Saved Connections”. It is, of course, unavailable as I’m not currently home.

I’ve gone into Luci, selected Network…Wireless and then edited the existing Wireless Client shown (the one that is NOT the WLAN created by my Mango device) to the new SSID.

As soon as that change is made, I can no longer connect and have to reset the router to factory defaults.