In order to register an expense in the Financial Planning application, first you have to add an expense category. Pressing the plus button will show you a popup where you can add the name of the expense type. It is recommended to use short names.
You can’t add the same name for an expense/income category twice.
To save the expense category you can press the Save button or you can press the Go button on the phone keyboard.
After saving, you will notice that the last added expense type is automatically selected in the Add Expence/Add Income form.