If your using delta links then you will need to make the adajustment to the controlling iView.
If not, navigate via Content Administration to the Role that contains the iView, open the iView's properties and select the property category "Content - Transaction" , you will find the System Property here - enter the system Alias used to set up the system.
To check this go to System Admin-->System Configuration-->-->System Landscape-->Portal Content-->Systems, then select the appropriate system (you can right click and select Open-->System Aliases to check or just highlight the system and it should also be displayed in the Quick Info section