A. New Merge Field Button - Clicking this button starts the process for creating a new merge field.
B. Custom Merge Field Info - each row contains data pertaining to an individual merge field. This information includes the Name, Description, Type (image or string), and the Value.
C. Edit Button - Click this button to edit the name and/or value of the merge field.
D. Delete - Click this button to remove the custom merge field completely.