I'm no expert, but the tags are as follows, using <> instead of []
<table> starts making the table
<tr> starts a new row of the table
<td> starts a new cell within the row
</td> closes the cell
</tr> ends the row
</table> ends the table
You may also wish to make use of a table BBcode generating tool, such as
this. Sorry I can't be of more use, but I am still figuring out the capabilities of BBcode myself!