Contributions from the open source community--especially first time contributors--are welcome and encouraged. Thank you for taking an interest in this project.
You should open up a new issue that describes your question or your idea. Be sure to look through the existing issues.
You can ask questions about how a function works, about the documentation for a function, or about the package in general. If you have an idea for a new metric function that can be added to the package, be sure to describe how the metric is used.
You should open up a new issue that provides a reproducible example of the bug. If you've never heard of a reproducible example (or reprex) before, you can read about them here. The goal of a reprex is to make it as easy as possible for me to recreate your problem so that I can fix it.
If this is your first contribution to an open source project, I recommend that you read this.
Otherwise, please make the pull request from your forked repo against the master branch of this repo.