You need to use the table button and then insert the rows and columns. So it'll look like this (only with square brackets)
(table)
(tr)(td)Column 1 Row 1(/td)(td)Column 2 Row 1(/td)(/tr)
(tr)(td)Column 1 Row 2(/td)(td)Column 2 Row 2(/td)(/tr)
(/table)
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