Adding Arrows 
You are in Design Manually mode.
Choose or click the Design Manually button.
Choose or click the Arrow button.
Click the Perspective box from where you want to draw the arrow.
The Perspective box is highlighted and displays black points.
Rest the cursor on a black point, and drag it to the desired perspective.
The arrow is drawn from the starting perspective to the destination perspective.
Caution
Do not choose Auto-Layout mode after adding arrows. Auto-Layout organizes diagram objects into a predefined layout and cannot be undone.