The name of the field in the form must exactly match the name of the field in the list.  For example, the web form will contain a field for entering an email address.  (Since every subscriber list contains this field, every web form must also contain this field.)  The name attribute given to the field in the web form must be “emailaddress,” as this is the exact name of the field in the Email System list.

<input type=”textbox” name=”emailaddress” />

One need not include a form field for every field in the Email System list – only those which one wishes to have modified.  Therefore if, for example, you have registration data fields in your Email System list, users updating their contact information will not be able to overwrite that information accidentally.