There is a simple ticketing system we use inside a git repository that lives here: https://gitlab.com/splotr/tickets/-/issues.
You can use it to describe issues and desired changes to the Library system as well as the Library website. There is a lot of options but you can just ignore them and stick to the blue buttons:
Please check when there are replies to the issue, you can follow the discussion add further comments and notes with the blue link Comment at the bottom of the page. When the issue is resolved you can Close Issue.