Hello,
If you are adding Custom Fields to your Forms, you will need simply need to edit the HTML Codes and change the Input Name/ID according to the Field Name you want to display in the Form Email Response. That's it! You do not need to edit any Codes in the include/form.php File except adding your Email Settings. Our Form Processor Codes will detect all your Custom Fields and process them acordingly.
Consider following this Code Sample: http://docs.semicolonweb.com/docs/forms/fields/#docs-code-example . Make sure that all your Custom Fields have the same prefix as defined in your Form.
Suppose you want to add Age Field to your Form which has the prefix template-contactform- defined, then your HTML should look like this:
<div class="form-group">
<label for="template-contactform-age">Age</label>
<input type="text" id="template-contactform-age" name="template-contactform-age" value="" class="required sm-form-control" />
</div>
This will display as Age in your Form Response Email. If you set the name Attribute as template-contactform-your-age, then this will display as Your Age in your Form Response Email.
Hope this makes things clearer.
Let us know if we can help you with anything else or if you find any further issues.