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In order to make a pull request, first you must be sure you have commits pushed to your fork. Once you have done this, visit the repository in question (CONNECT, Common-Types, CONNECT-Webservices) and visit the Pull Reqeusts Requests Tab.
Once at the Pull Requests tab you will see a list of all Open pull requests, as well as the option to create a new one via the "New Pull Request" button.
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