The Config page is where you set your default Email preferences for iENG.
At the upper left is the default 'Message' that will be automatically added to any emails, and other posts (Facebook, Twitter, Youtube) in order to save you time and effort.
You can also enter a default email subject line for all outbound emails.
On the right of the screen is where you enter a default destination 'SEND TO' address, and similar CC and BCC addresses for the emails.
All of the entries noted above can be overridden at the time the messages are prepared for sending, or when your post to Facebook or Twitter is ready to sent.