When you create a table (Insert>Table) you can edit the options; I've chosen to give the table:

2 Rows

3 Columns

50% Width (the table will be 50% width of your browser)

Border thickness of 1 Pixel.

You would now have a table like this:

If you click on your table and go to the bottom of your dreamweaver to the properties, you can change the whole table, to change the border colour from the default, click on the brdr color and choose a color, ive chos en blue.

Now we can change the amount of columns and rows, ive decided to have 2 columns and 1 row. These are now the properties of the table: