First of all, thank you very much for taking the time to contribute to the meta.
How to do it mostly depends on the type of contribution:

• If you have a question, please ensure there isn't already an answer for you by searching on GitHub under issues. Do not forget to search also through the closed ones. If you are unable to find a proper answer, feel free to open a new issue. Usually, questions are marked as such and closed in a few days.
• If you want to fix a typo in the inline documentation or in the README file, if you want to add some new sections or if you want to help me with the language by reviewing what I wrote so far (I'm not a native speaker after all), please open a new pull request with your changes.
• If you found a bug, please ensure there isn't already an answer for you by searching on GitHub under issues. If you are unable to find an open issue addressing the problem, feel free to open a new one. Please, do not forget to carefully describe how to reproduce the problem, then add all the information about the system on which you are experiencing it and point out the version of meta you are using (tag or commit).
• If you found a bug and you wrote a patch to fix it, open a new pull request with your code. Please, add some tests to avoid regressions in future if possible, it would be really appreciated.
• If you want to propose a new feature and you know how to code it, please do not issue directly a pull request. Before to do it, create a new issue to discuss your proposal. Other users could be interested in your idea and the discussion that will follow can refine it and therefore give us a better solution.
• If you want to request a new feature, I'm available for hiring. Take a look at my profile and feel free to write me.