use:
[table][tr][td] content [/td][td] content [/td] [/tr] [/table]
the table starts and ends the table structure.
tr stands for a row.
Inside the row, you have cells (td). Each row starts and end with tr (short for table row) and each cell starts and ends with td (table data)
This is basically a simplified way of html tables. Google for html tables for more information on the subject.