How to get to freeswitch cli

As explained here https://docs.bigbluebutton.org/2.2/troubleshooting.html#unable-to-connect-using-fs_cli

/opt/freeswitch/bin/fs_cli -p $(xmlstarlet sel -t -m 'configuration/settings/param[@name="password"]' -v @value /opt/freeswitch/etc/freeswitch/autoload_configs/event_socket.conf.xml)