Jupyter always open Notepad++ not a browser?

despite setting a config file, when I click to open Jupyter notebook, notepad++ always opens. I cant seem to change that to a browser even if the config file is set to browser = true , and the path to my browser etc.
I think when I first installed Anaconda I was asked which is a default program to use, I clicked on notepad++ by mistake and now I am stuck?? any ideas…