Everything though the very clear web based set up, using your web browser.
Although it didn't work fully after initially setting up. I could only see pages through direct IP addresses. After switching everything off and coming back the next day it all sprang to life.
Full marks to TP-Link's on-line support who responded very quickly to my pleas for help.
This WAP can be used to extend your wireless network with or without Ethernet cables. Or, like in my case, use it to connect a device with an Ethernet socket to my WiFi network.