You must have a Function Point Modeler diagram open. By default, the Palette view opens when you are editing Function Point Modeler Diagram file in Function Point Modeler.
You can use a Function Point Modeler diagram to create connections between an Internal Logical File (ILF) and an External Interface File (EIF).
To create an actor und sub system connection:

Creating connection between an Sub and Sub System in a Function Point Modeler Diagram
Creating connection between an Actor and Sub System in a Function Point Modeler Diagram
Creating connection between an Elemantar Prozess and an Logical File in a Function Point Modeler Diagram