add a form to the detail page with a text box in it for entering the email address the email should go to.
Use the following code for the forms action and set the method to POST:
<?php echo htmlentities($_SERVER["PHP_SELF"]); ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".htmlentities($_SERVER["QUERY_STRING"]):""; ?>
in universal Email, set the trigger to use the form submit button.
for the to address, click the lightning bolt and select the email address text box from the form.
The version of Universal Email included with Form Builder is exactly the same as Universal Email 4.