How can I activate the Totals button that is grayed out in PSI

How to active the Total button in Oracle PSI

The Totals button is activated through the set up of Project Status Columns.  After navigating to
Setup -> Project Status Columns,
 enable the Total check box for each column you want to total for column summarization and save your changes.

 NOTE: You cannot click in the Segment 1, Name, or Over Budget lines.