Several nuclei with a hydrogen atom

I want to use several different separate IPython kernels at the same time on different Atom files with the Hydrogen plugin. By now I can use Hydrogen, it works great, but the same kernel is used for all files (so I cannot run multiple files at the same time).

I am aware of this here: https://github.com/nteract/hydrogen/issues/40 , but I am having a hard time figuring out which method I should use and implement in practice. I believe it is still developing a little.

In particular, I can use Crtl+ Shift+ Pand search for [hydrogen selection kernel], but then I only see one entry named [Python 2]. I don't find any command to open new Python2 kernels (to choose, for example, between [Python 2 inst 1], [Python 2 inst 2], etc.).

So my question is:

Is there an easy way to open multiple separate instances of the Python 2 kernel in Hydrogen?

If not, does anyone have a good way to suggest (it would be nice to have a description of the detailed steps) for using multiple nuclei in hydrogen at the same time?