Are you trying to use it as a wireless router?
http://www.tp-link.com/en/article/?faqid=616
If the domain won't work, try http://192.168.0.254.

Thanks for those suggestions, but I had tried those myself, with no success.

I wanted to set up the "Client" mode to use a remote NAS storage for backup via wireless.

I have now succeeded in getting to the setup dialogues, this is how I got there:

First I disabled my Laptop's wireless connection to my regular modem/router and disconnected the ethernet cable connection between the Laptop and the 710.
Next I plugged in the 710 to the mains supply and then set up the Laptop wireless connection to the 710's wireless SSID.
Then, using a browser and the 192.168.0.254 address, I was able to get to Setup and to configure the 710 to Client Mode according to the instructions provided.

I can also confirm that Client mode does work with NAS Storage.

Thanks again for your reply.