Revision history [back]

It sounds like you are trying to edit the files that a particular package has deployed. This is not a sustainable way for doing development, so if you intend to do more than a quick hack I would recommend doing it 'properly'.

Instead, you should setup a development environment following the instructions here: and read the documentation on customising Horizon:

To work with Horizon, you should first learn how to use django. The tutorial on their website is excellent.