1.Double-click on the cell table in the worksheet or document to open it.
2.Click to select any cell in the row before which you want to insert a new row. If you want to add a new row behind the last row, no cell in the cell table should be highlighted.
3.Click Design[Table Layout] > Add Table Element and select Row.
Note: If you have highlighted the last cell in the bottom right-hand corner, you can easily add a new row by pressing the TAB key. The same thing works if you select the first cell in the upper left-hand corner and press the TAB key while holding down the SHIFT key.