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This means installing a tool to retrieve the PrestaShop code from Github, edit it at will on your machine, and send your changes back on PrestaShop's Github. The easiest way to achieve this is to install TortoiseGitYou can find instructions on the Github website (more here), but the best way to go is to learn more about Git and Github:
- The Git book: http://git-scm.com/book
- git ready: http://gitready.com/
- Git Immersion: http://gitimmersion.com/
- Think Like (a) Git: http://think-like-a-git.net/
- Git cheatsheet: http://byte.kde.org/~zrusin/git/git-cheat-sheet-medium.png
- Try Github: http://try.github.io/
- Github help: https://help.github.com/
