It looks to me like you cloned the main repository to your computer
rather than forking it.
To fork the repository, you should use the online interface for github.
Log into github, and then go to the repository's page:
https://github.com/gregorio-project/gregorio
Upper right hand corner there's a button labeled "Fork". Click on it
and this should create a repository for you in your account. Since it's
a repository in your account, you'll have write access to it.
Clone this repository using the software and then try the checkout
command again. If you get the warning about a detached head, then you
need to make sure that when you checkout the remote branch (the one in
your repository) you're creating a local branch (on your machine) that
will track your changes.
Once you've checked out a local branch which tracks the remote one, try
the modify, commit, and push steps again. You shouldn't have any
permission problems here.
Then you'll be able to create a pull request.
✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝
Br. Samuel, OSB
(R. Padraic Springuel)
PAX ☧ ΧΡΙΣΤΟΣ
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