Rodauth, while a mature framework, is still under active development. You can join in on the discussions, ask questions, suggest features, and discuss Rodauth in general by joining the rodauth Google Group.
To report a bug in Rodauth, use GitHub Issues. If you aren't sure if something is a bug, post a question on the Google Group. Note that GitHub Issues should not be used to ask questions about how to use Rodauth; use the Google Group for that.
The master source code repository is jeremyevans/rodauth on GitHub.
The easiest way to contribute is to use Git, post the changes to a public repository, and send a pull request, either via GitHub, or the Google Group. Posting patches to the bug tracker or the Google Group works fine as well.
Rodauth is distributed under the MIT License. Patches are assumed to be submitted under the same license as Rodauth.