This dialog appears when you select the As a Blank Report category and click Create in the New Report dialog. It helps you to choose the dataset you want to use to create the report. See the dialog.
The following are details about options in the dialog:
Define a dataset for this object
Specifies the dataset from which the report will be created.
OK
Accepts changes and closes this dialog.
Cancel
Does not retain changes and closes this dialog.
Help
Displays this help document.