The page is available only when the Phing Support plugin is enabled. The Phing Support plugin is not bundled with IntelliJ IDEA, but it can be installed on the Settings/Preferences | Plugins page, tab Marketplace, as described in Installing plugins from JetBrains repository.
On this page, enable Phing integration in the current project.
Path to Phing executable
In this field, specify the location of the phing.bat file. Type the path manually or click and choose the file location in the dialog that opens.