I have this same problem. Just downloaded the software and it seems pretty good. Found this in the help files:
Split transactions are used to itemize transactions larger transactions into smaller amounts with multiple categories.
Add
Click the Add button to open add a new split for the current transaction.
Delete
Click the Delete button to delete the selected split for the current transaction.
However, I find no "add button" to open a new split for the current transaction. Maybe I'm just not seeing it, but....
Any help to this newbie would be appreciated.
Iris