The best way to do it as mentioned in that page was to use a style in the cell tag. You could do it using:
Code:
<td style="border: 1px solid red">...</td>
But if you have lots of cells which you want to have the same style, a better thing to do would be to set up a class in your HTML/CSS file...
Code:
.redcell {
border: 1px solid red;
}
That would either go into a CSS file you have linked via the <link> tab, or inbetween <style> tags in the <head> section of your HTML page. Then whenever you wanted a cell with a red border, you would simply use:
Code:
<td class="redcell">...</td>
Let me know if you want me to explain better (it's late though and I'm getting a few quick answers in

)