To create a change package:
The list of existing change packages appears.
If automatic change package numbering is active, then the edit panel for the new change package appears (a number will be automatically assigned to the change package when you save it).
Otherwise, a pop-up window appears, prompting for the name of the new change package. Enter a name.
The following step is important: you need to save the change package before you can add resource definitions to it (or do anything with it, for that matter).