First of all, clone the repository:
If you only need reading-access simply use:
You need to tell git who you are. That means you must execute the following commands with the appropriate parameters:
git config user.name=YOUR_USERNAME git config user.email=YOUR_EMAIL_ADDRESS
It seems that your e-mail-address doesn't need to be valid. I advise you to write gibberish as your e-mail adress because it will appear in the public commit messages and spammers will be able to harvest it.
After that you can start editing stuff.
Now you need to explicitly add modified files with
git add FILE
(It's possible to automatically add modified files with "git commit -a")
And then do a local commit with
And afterwards you can do a remote commit with