1. Get the comment thread ID by looking at the URL, for example:
2. Go the the server, access the mongodb cli, delete the comment by ID:
MongoDB shell version: 2.4.10
connecting to: test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
Questions? Try the support group
> use cs_comments_service_development
switched to db cs_comments_service_development
P/S: I also updated this to the documentation of OpenEdX's comment service: https://github.com/edx/cs_comments_service/wiki/Query-or-Delete-comments-data-in-mongodb