Click on the grey shaded area of the text box, corresponding to the column/row that you would like to amend.
The cell editor window will appear.
At the bottom of the cell editor is 'Table Actions'.
Select the desired option: The first two options allow you to rearrange the position of the column/row shown by the arrow. The second two options allow you to add a new blank column/row to either above/below or to the left/right of the original column/row.
Save and close cell editor.
Your new column or rearranged column/row is now available to edit.
Publish when changes are complete
Clicking on a single column/row allows you to edit the display of your column/row. Here, you can change the minimum width of the column/row, the alignment of items within as well as the background colour.