On the Add Operation dialog, there are three fields at the top: Visibility, Kind, and Name. Select visibility with the drop-down menu. Select Library Function in the Kind with the drop-down menu. Specify the name. The Return Type is pre-selected. An Edit button enables you to edit the return type. A Clear button lets you clear your edits. There is a Parameters table with two columns: Name and Type. There are five buttons: Add, Edit, Remove, Up, and Down. There are two options: Primary and Empty Function Body. Primary is selected.