From here just select the service you want to restart and click the “Yes” button like in the following image .
The example is for the pure-ftpd service, but the interface is the same for all other services.
After the service is successfully restarted you will get a message like :
Waiting for ftpserver to restart………finished.
pure-ftpd (pure-ftpd (PRIV)) running as root with PID 4062 (process table check method)
pure-authd (/usr/sbin/pure-authd -s /var/run/ftpd.sock -r /usr/local/cpanel/bin/pureauth) running as root with PID 4050 (pidfile check method)
ftpserver started ok
For more details please visit the official support page at cPanel Documentation