To insert a table:
Alternatively you can drag and drop the Table toolbox item. This will create a default table that can be customized later.
Tip:
Once you've inserted a table, you can customize it by using the
restructuring toolbar and by editing its properties.

This toolbar allows you to restructure an existing table by inserting or deleting cells, rows and columns.
In order to select one or more cells, hold the Ctrl key and click on table cells. In order to select the whole table, hold the Ctrl key and click on the border of the table.