To uninstall the Firebind Agent use the uninstall program that came with the install.
Go to Control Panel->Programs and Features and find the Firebind program. Then right click on it and select Uninstall.
To find the uninstallation program locate the directory where the Firebind agent is installed. This is usually /opt/FirebindAgent or /usr/local/FirebindAgent or /usr/local/bin/FirebindAgent. In that folder will be an uninstallation program. Run that with root privileges (sudo) and the uninstallation process will begin. It may be necessary to invoke the uninstaller with a -c argument to specify command line interaction.