Often you'll want more than one row and one column in your table.

To add a column you need to edit the cell rather than the table. Click on the Edit icon within the table (it will show "Edit Table Cell" when you move your mouse cursor over it). The cell properties will appear in the Properties Frame.

Below the cell properties are the buttons you'll use to add columns and rows.

To add a column, click <- Insert Column or Insert Column ->, depending on whether you want the new column on the left or the right. To insert a row, click either the Insert Row Above or Insert Row Below button.