The modem does not require anything other than to be connected to an active VDSL line, it then connects to your router which then handle authentication and communications with the ISP...
So usernames and passwords that are provided by your ISP (EE) will need to be entered into the PPPOE sections on your router only and then modem just needs to be connected to your incoming line, power supply and WAN port on router.
I hope this clears up your concerns
Plusnet Unlimited 21CN 3700/768 @ 4.2Km
> TP-Link TD-W8968v3
Plusnet Fibre Extra 65000/20000 @ 450m > HG612 > Asus RT-AC87U