Reports
Something in the garden is not behaving? Say so here. A clear report with the steps to repeat it is the most useful thing a stranger can give this project.
What helps most
Where you were: the browser, the terminal, or Discord. What you did, and what she did instead, in her exact words if you have them. The version from the header, or from kotoba --version. Whether it happens every time.
What happens next
The form can open a prefilled issue on GitHub, where it is public and where the work is tracked, or send the same report by email to the maintainer alone, with your address as the reply-to if you give one. Either way you press the last button yourself, so nothing leaves without you seeing it.
A security problem
Never in a public issue. Choose that kind in the form and it hands you to GitHub's private advisory, which reaches the maintainer alone. There is more on what to include in Reporting a vulnerability.