First, you want to change the FORM ACTION="myresult.php", this script will display/process the data that was submitted to it from the form, whose name you have given "myform".
Create "myresult.php". Whatever you named the 2 text fields and 1 textarea will be the name of the variable that contains the data for that respective input field. So, "myresult.php" should look something like this:
<head>
<title>myresult.php</title>
</head>
<body>
<?php
print("Email = $usersemail<br>\n");
print("Subject = $userssubject<br>\n");
print("Message = $usersbody<br>\n");
?>
</body>
What this will do is display the email, subject, and message they submitted from the page/form you named,"myform". What you decide to do with those 3 variables is all within the realm of possibilities...