Click on the down arrow on the tab labeled Report 1 and select New.
Now there will be two tabs, Report 1 and Report 2. Click again on the down arrow to select Rename on the preferred report tab rename it to something more useful.
Please note that Report 2 is blank by default.
Click the chart icon in the Insert panel section on the top to select a table type and click into the report to add a Table. Then, click on the Document Objects panel on the right and drag and drop fields as needed.