Open your browser in InstaCode.es to publish a piece of your code.
In Atom, open Preferences > Packages, search for InstaCodes package. Once it found, click Install button to install package.
You can install the latest Instacodes version manually from console:
cd ~/.atom/packages
git clone https://github.com/arandilopez/instacod.es-plugin
cd instacod.es-plugin
npm install
# Then restart Atom editor.
Please report any problems or suggestions at issue tracker.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.