On Windows
In Start menu, choose Control Panel – Uninstall a Program, then select HQbird Server Side or HQbird Admin, and uninstall HQbird. Uninstallation requires administrative rights.
On Linux
With sudo rights, run
/opt/hqbird/uninstall.sh
It will uninstall HQBird from the /opt/hqbird and /opt/firebird, and remove autostart services files.