Hi.
To all brave testers who wants to fix something in Picochess V4 here is a short 6 minute video on how to make a new issue. From that issue a branch is created. The branch can be edited on your local machine if you are comfortable with git commands add, commit, push.
Or any file in the branch can be edited on GitHub web page as shown in the video.
The video ends with how you make a Pull Request (PR) which is a proposal to accept the change. Anyone can then review that change and if 2 developers approve it, it can be merged into main branch for everyone. Its usually a good idea to test first :-)