To build the control flow in the package, drag objects from Control Flow Items in the Toolbox to the designer surface and ...

To build the control flow in the package, drag objects from Control Flow Items in the Toolbox to the designer surface
and then connect the objects by selecting them and dragging their connections to another object.
To edit objects, double-click them.
To extract, transform, and load data, add a Data Flow task and build its data flow.