Make sure you have forked, cloned your forked repository and bootstrapped the project. You can follow the steps in README.md on the Installation guide.
Have separate branch for PR.
git checkout -b <enhancement_feature>
Before requesting a PR, make sure you have tested your project locally and is working correctly. Also make sure your branch is up to date with the master branch. Follow the guide here https://gist.github.com/whoisryosuke/36b3b41e738394170b9a7c230665e6b9
After you have committed your changes and pushed your branch. Request a PR for review. Describe your changes, providing a clear and concise description about it. If you are encountering a specific issue on your environment, it is best to provide details about your OS and Node environment.
Me or someone will review your PR and will be merged accordingly. Good luck!