With my previous TP-Link Archer wireless routers, it was extremely simple and straightforward in the web configuration pages to assign or change the device name associated with either a MAC address or an IP address(?), but with my new Archer A8, it is either ridiculously difficult or outright impossible!

Is it actually possible? If so, how do I do it?

It seems that it might be possible from the Tether app on my phone, but I'd much prefer to use the web configuration pages.