Click File-New Chart window and make sure you are on the "Instrument" tab. Click the "Add symbol" button.
Make sure you are on the "Futures" tab on the "Insert symbols into portfolio - CQG" window. Within the the "Symbol" field type the symbol you wish to add and hit "Look Up" once it is located simply select to highlight and hit the "Add" button. Now the symbol can be located and used within your MultiCharts software.