To contribute a change to the IGB code base, create your own fork of the IGB repository.
To create your own fork:
Next, you'll see a form that let's you give your fork a name and description. Here's an example:
Fill in the fields and click Fork repository.
See Atlassian documentation Forking a Repository
Clone a copy of your forked IGB repository onto your local computer. Make changes to your local clone, commit them to your local repository, and then push your changes upstream to your fork.
To request that your edits be incorporated into the main line of development:
A Pull request form will appear. Fill in the fields:
