Comments are posts like questions or answers, just with a different type. They're stored in the table qa_posts and have the value "C" in the type field (except for queued and hidden comments, which have the type "C_QUEUED" and "C_HIDDEN" respectively).
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.