To make more rows at the end of a table, place the cursor in the last cell in the bottom row, and press the tab key. A new Row is created. Keep pressing tab until you have as many rows as you want
To make more rows in any other place in the table, place the cursor in a row above or below where you want the new row to be. Click on the menu item Table, and select Insert Rows or Columns. Make sure Rows is selected, enter the number of rows, and select Above or Below, Click OK and you are done