automated actions

sir i got it i installed it.......thankyou for your help..and one more thing in automated action i created a new one with object "crm.lead"
and server action as email.
then in email action what does the following fields means what should i enter to sent automatic email
Code:
'act_email_from' : fields.char('Email From', size=64, required=False,
                help="Use a python expression to specify the right field on which one than we will use for the 'From' field of the header"),
        'act_email_to' : fields.char('Email To', size=64, required=False,
                                     help="Use a python expression to specify the right field on which one than we will use for the 'To' field of the header"),