How do you create an approve and reject button within Email Notifications?

Can you explain what you are wanting the Approve and the reject Button to do.  What is the field ID# of the field to be updated and what are the respective values for the field.  Then what do you want to happen after the button is clicked in terms of refreshing a report or a record back to the user.  Is there a report to be updated  and redisplayed of records still needing to be approved?