First prepare the part:
(Home tab > Mold Type panel > Part Only).
(Home tab > Molding Process Setup panel > Injection Location), to set an injection location on your model. Cross-hairs will appear. Click on the cavity to locate the injection position(s).
(Home tab > Molding Process Setup panel > Analysis Wizard), and then select an analysis sequence from the list. The analysis preconditions are displayed in the Analysis information pane.
(Home tab > Analysis panel > Start Analysis) to perform the analysis.