json file location in command prompt

i am trying angularjs-2 for the first time from the examplefound here

and everything was working fine until i came to a point where the author has written something like this

Now open the package.json file location in command prompt and execute the below command to load the required modules and supported files which are mentioned in the package.json file.

npm start

after reading this i open command prompt by pressing ctrl+R and write cmd and i enter the following path

E:....\nodejs with angular2 testing\nodejs with angularjs2\nodejs with angularjs2\

but i am not able to do anything after this point

how can i execute the package from command prompt,

i tried the same with developer command promt but facing the same issue,

hey guys i know i am bad in english but please i need help here

via Mumbai Wadala