How to stop the form from sending when users hit enter

[Amata]

I have made some forms that users can use to fill out their data, but when filling out the fields if they hit enter the form automaticly sends the mail and in the editbox only one line of text is visible, while I would like them to be able to hit enter and see various lines of text. one example of the forms I am making is : https://www.amata.es/Inscripcion.php.

Is there anyway to accomplish this?

[Pablo]

Did you use a "text area" object for multi line input?

[Amata]

Thank you sorry to trouble you with beginner mistakes!!