Then drag and drop the Size field from the Field Chooser list to the area between any of two grey field headers to add the Size field to the message pane
Yna, llusgwch y maes Maint o'r Dewiswr Maes a'i ollwng rhwng penawdau llwyd unrhyw ddau faes i ychwanegu'r maes Maint at eich cwarel negeseuon.