-bash: express: command not found after installing express and express-generator with NPM

Question

I have a server with NodeJS and NPM already installed. Then process to install Express with NPM:

$ npm install express -g

It answered:

Answer 1

Installing express-generator, we see

/var/www/site/npm/bin/express -> /var/www/site/npm/lib/node_modules/express-generator/bin/express

Add /var/www/site/npm/bin to your $PATH