I don't know why someone had an issue with configuring it via iPad but it is possible. You need to set a fixed IP according to the router manual since by default it works in AP mode (with dhcp disabled), so once you set 192.168.0.1 , router gateway 192.168.0.254 and subnet 255.255.255.0 you can connect by typing 192.168.0.254 in the browser with admin/admin login/pass details.
I am not sure if there is any different between TL-WR702N which I have and TL-WR700N but I believe not.