First, install node.js (at least 0.8).
(sudo) npm install -g git-ghgit ghsetup
And follow the prompts. Your password is never saved. You can see the config file .gitgh in your home directory if you don't believe me.
git list [filter]
List open issues and pull requests. The "filter" parameter can be any of the following
git detail <id>
Get detail on issue/pull request with the given id
git claim <id>
Assign the given issue/pull request to yourself
git assign <id> <username>
Assign the given issue/pull request to username
git issue [-t 'title for issue'] [-m 'body of issue']
Open a new issue, if a title is not specified one will be generated by truncating the body. If a body is not specified, your default editor (or vim if $EDITOR is unset) will open with a temporary file. Whatever you save to that file will become the message body.
git pr [branch] [-t 'title for pull request'] [-m 'body of pull request']
Open a new pull request. The "branch" parameter is the branch you'd like your current branch to be merged into. The title will be set to "Merge yourbranch" if unspecified, and an editor will be spawned for you to specify a body much as the above issue command.
git comment <id> [-m 'your comment body']
Comment on issue/pull request id, if no message body is specified an editor will be spawned for you to type one in
git close <id>
Close the issue/pull request. This will not merge a pull request.