File | Settings | Phing for Windows and Linux
IntelliJ IDEA | Preferences | Phing for OS X

The page is available only when the Phing Support  plugin is enabled. The  plugin is not bundled with IntelliJ IDEA, but it can be installed from the JetBrains plugin repository as described in Installing, Updating and Uninstalling Repository Plugins and Enabling and Disabling Plugins.

On this page, enable Phing integration in the current project.

ItemDescription
Path to Phing executable In this text box, specify the location of the phing.bat file. Type the path manually or click the Browse button browseButton.png and choose the file location in the dialog box that opens.