HP Printer is not connected anymore after change to Fibre

[#1]

After getting Fibre, my HP Wi-Fi printer does not connect anymore while it worked perfectly well with ADSL broadband before. Online chats with 2 different PlusNet agents were confusing and did not sort it out.
Since I have received an OpenReach BT router, it seems that I cannot access the PlusNet system to add or remove devices on my network, as I used to do easily with ADSL PlusNet broadband before. I was told to link to BT home hub system but the link, http://bthomehub.home, does not work...
Can someone help me with the way to access the OpenReach router permissions to add the MAC reference of my printer and other devices, please ?
Thanks.

[#2]

Sounds like you are trying to get access to the OR modem, which you can't unless it has been hacked. The OR modem is just that, a modem. You need to plug the router that should also have been sent to you into the modem as there is no standalone modem/ router option from PlusNet.
Mark

[#3]

Thank you Mark. Sorry for the late reply as I had been away.
Correct, I do have an OpenReach Router and a separate PlusNet.
The agents at PlusNet told me that I had to access the router as they could not help with my printer.
This is weird and I stil don't have a connected printer.
I was hoping that someone at PlusNet would have a solution since it seems that I do not have any option to add or remove any devices on their router address http://192.168.1.254
Well, will keep trying.
Best regards
FL

[#4]

Hi,
Which HP printer is it?
With our Deskjet F4580; I had to use the USB connection to setup the new wireless connection on the printer following the change from an ADSL Modem/router to the new router supplied to work with the fibre modem.
It took me a few goes to get it sorted as I also had to remove all traces of the printer from my PC as well!