Website of MES conference:
The "your name" is optional.
Field "email" must be filled only if you would like to get an answer.
If you want to attach a file to the message, click the "Browse" and select the file on your computer,
either immediately specify its name in the "Attach a file".
One of the fields "Message" or "Attach a file" should be not empty.
In order to send the message, press "Submit".