You simply need to right-click and there are various options that are available. Click insert rows and you will automatically have the extra row that you need. There are instances when you would need to do this action more than once especially since you would like to add three rows. You can also choose if you want to insert the rows above or below the chosen cell.
If you are going to delete the table and start over, this will take you more time. Adding rows is the easiest option that you can find. Left click will not give you the options that you need. It is doing the right-click that will provide you with the option to insert more rows.