Changed password causing router problems!

[#1]

Hi I changed my password on my plusnet account a couple of days ago, then a day later I had no internet access. I spoke with one of PN online support team who told me it was the fact that I had changed my Password with them but not with my Router.
I have a Tplink TD-W8961ND and I'm pulling what's left of my hair out trying to change it following their online guide but I've still no success. Can someone please help me out?

[#2]

As it is not a Plusnet supplied router there is no on-line guide. From a quick search this is probably shows you where you need to be looking:

https://www.manualslib.com/manual/358686/Tp-Link-Td-W8961nd.html?page=25#manual

I'd expect the username on that page to be yourplusnetusername@plusdsl.net

[#3]

The link @jelv provided should help you get this sorted. If I remember correctly the address to go to in your browser is 192.168.1.1 and then log in using your router's credentials.

[#4]

That's it fixed guys. Followed Jelv instructions and worked a treat. Thank you 🙏🏻

[#5]

Glad to hear it's sorted.