Assuming the web server is installed at /usr/local/lsws.
Use the lswsctrl control script in /usr/local/lsws/bin/ directory.
To start the web server:
/usr/local/lsws/bin/lswsctrl start
To stop the web server:
/usr/local/lsws/bin/lswsctrl stop
To restart the web server:
/usr/local/lsws/bin/lswsctrl restart
To reload the configuration:
/usr/local/lsws/bin/lswsctrl reload