Hover over your table and click the blue plus sign below your bottom row, or simply press Enter on your keyboard.
To select a row in a Table, click the row handle that appears to the left of the row when you hover over it. Or, if you like keyboard shortcuts, click a cell and arrow all the way to the left to highlight the entire row.
Select multiple rows
Select the first row, then press Shift or Command to select another row. If you're selecting an adjoining row, you can just arrow down or up while holding down Shift if you prefer.
Delete multiple rows
Once you've selected a row(s), you can delete them by simply clicking delete on your keyboard. You can also delete one or more rows by using right-click to bring up the row menu and select "Delete row".