Can't you just rename the user? If you can't do it through the admin section, you can do it in the database without messing anything up. In the `qa_users` table, edit the `handle` field.
The alternative is to delete that row from the user table - all that will happen is any questions/answers they posted will show up as "by anonymous".
Update: you can now delete users through the admin interface. Just go to the profile and click "Delete user".
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask 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.
July 15, 2020: Q2A 1.8.5 released!