If you've built a package you want to publish as a public package to npm you can follow these steps:

1. Sign up
2. Create an organisation
3. Choose the following option
4. On the command line, navigate to the root directory of your package

cd /path/to/package

1. Authorize the machine to publish a package

npm login

1. Publish the package

Assuming you've built the package correctly, you can publish it like this:

npm publish --access public

If you're interested to see a package publish exactly this way, take a look at this repository:

github.com/utopiops/utopiops