I changed the password on my Hub 3.0 (settings one you can get on the phone) I believe it’s the one off the bottom of the router. I’ve since forgotten what it is and can’t get in to it. No option for forgotten password either!
(p.a not the one that connects you to the devices)
To reset the router you should keep the reset button pressed in for around 60 seconds to be on the safe side. Try using a paperclip or something strong, but not a ball point pen. It's also best to remove any ethernet cables from the hub whilst doing that.
Leave it alone for around 5 minutes so it has chance to update back to factory settings.
Then log into the hub via your browser using the settings password (8 numerical characters) you should then be able to change the wifi password via the hub settings
The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali