To insert a row:

1. Click Insert > Row. You can insert multiple rows by selecting as many rows as you want.
   
2. ​Alternatively, you can select "Insert" from the right click contextual menu, and click on "Row" from the drop down. Select multiple rows or columns to insert corresponding number of rows or columns.
   
3. Select if you want the row to be inserted above the selected row or below the selected row.