Thanks for contributing to this project.
To get started, check out the issues page. You can either find a feature/fix from there or start a new issue, then begin implementing it in your own fork of this repo.
Once you are done making the changes you'd like to make, start a pull request to the dev branch. State your changes and request a review. After all branch rules have been satisfied and the pull request has a valid reason, someone with management permissions on this repository will merge it.
You could also make a draft PR while implementing your features if you want feedback or discussion before finalizing your changes.