Enable nbextensions in jupyter notebook

I have installed nbextension AUR and I restarted jupyter. I even tried to follow instructions on the github page of nbextensions.

I get the error Exception: Jupyter command jupyter-contrib not found. when I run jupyter contrib nbextension install --user.

I have hit a roadblock that I can’t seem to get around.

It looks like you are trying to use these things as user/ in HOME.
And looking … the same is often said for using pip to install jupyter_contrib_nbextensions
like here:

Should I remove it and then manually try to install it? Like solution down below? (I would have shareed link but this forum says I am not allowed to post links)

If so, where can I find

python application.py install