When creating a new report, no columns are included to start. To add columns to a report:
Right-click at the top of the report and select Column Chooser. The Column Chooser dialog box appears.
Drag the name of the column to the top of the report from the Column Chooser dialog box to the Drag a column here... panel.
If columns are already in the report, drop the new column near the columns that are already included in the report. Two arrows appear when dragging a column to display between other columns.