You can add tables by clicking on the Table button in the toolbar.

Choose the first option, labeled Table. You can now choose the grid-size of your table. You can now resize your table by dragging its points or the inner lines.

You can edit the table you created by placing your cursor on the table and subsequently clicking on the Table button in the toolbar. Choose the second option, labeled Table properties.

Here you can change the size and alignment of your table, as well as edit the border. It's also possible to give your table a different look, using the Class label. 

Here are the options available:

Hover is similar to Striped, but will only highlight the row the user is hovering over.
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