Even after installing Anaconda on my PC, I am unable to access Jupyter Notebook on my command prompt



Hello everyone,
I am trying to work on spacy with python. I am using windows10 and had anaconda 2.7 earlier but to run spacy, I uninstalled it and installed Anaconda 3.6. Now, whenever I try to access jupyter notebook on my command prompt, it prints the error
’Jupyter’ is not recognized as an internal or external command,
operable program or batch file.

Contrary to this, when I access jupyter notebook on anaconda prompt, I am able to do so.
Can anyone tell me the reason why this is happening and how to fix it?