Once a trade system has been defined, the name of the system appears in the Add Study windows like any other study and can be displayed like any other study, using either a toolbar button or one of the Add Study windows.
The backtesting display appears as two windows: a top window showing the entry and exit points, and whether the individual trades are profitable, and a second window showing the amounts of the profits or losses for the system as a whole and giving various statistics related to the system.
Sample trade systems and customs studies are found here.