If you haven't created anything in your local repo yet, the easiest way is this.
Make a clone of the Google Code repository:
hg clone https://your_project.googlecode.com/hg your_local_repo
This will create a directory " your_local_repo" with a local repository in it. Make changes and
hg commit -m "Your commit message"
to commit changes to your local repo. Then
hg push
to make changes to the repository on the GC.
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