How to add a side bar in your blog?

My original blog template have 2 side-wrapper that is separated into half.

I want to add another side-wrapper. So I add in "side-wrapper3".

It is quite complicated but if you know a little bit about programming, you can do it.

Just add the below text, remember to add <> to complete it.

div id='side-wrapper3', b:section class='sidebar' id='sidebar3' ,preferred='yes'/ ,/b:section /div

Then find side-wrapper2 and copy the all the attribute and change 2 to 3.
Last, find side-bar2 and copy the all the attribute and change 2 to 3.