Go to the Configuration area by clicking on the Settings gear . Then select Portfolio Plan from the left navigation, and click on the Dates tab.

There is only one field in the Dates settings area: Pivot Q1 Start Month. This setting allows you to select the start month for Q1 in the Portfolio Pivot table. This is applicable if your "year" begins at a different time than January 1, for example.

To update the start month, click into the Pivot Q1 Start Month. field, then select from the following options:

In this example, I selected 7, meaning Quarter 1 in my Portfolio Pivot table begins in July. When I go to the front end, open up the Portfolio Pivot, and view it in Quarters, you can see that Q1 starts in July.