Blogging Basics – 3 Column Templates
A Word of Warning: Before changing or editing your template, it is always a good idea to backup your current template so that if anything goes wrong, you can always revert to the previous template. To backup your template, sign into the Dashboard, click the “TEMPLATE” tab, then click the “EDIT HTML” sub-tab which will open the template editor window. At the top of the page, click “Download Full Template” and save the template into a folder which you can easily remember.
Blogcrowds have many of the original blogger templates converted into 3 column templates for you to use.Once you have done that go back to your Blogger page, click the “TEMPLATE” tab, then click the “EDIT HTML”. You will see a window with some html code in it. Above the window is a check box which says “Expand Widget Templates”. You will need to click on this box so that your existing widgets don’t get deleted.
Next, highlight all the html code in the window and paste your new template code in there. Click “PREVIEW” and then save it if you are happy with it.
Filed under: Blogging
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That’s some good information – at first I tried really hard to find a template that I liked in 3 column, now I’m happy with my 2
Oh, I’m here via Amanda’s TT13 post 
I tried to use this method to make my blog 3 columns. When I hit preview it showed my blog but all the stuff on my side bar and even my blog archive is gone. I don’t mind having to replace all the junk on the side bar, but I don’t want to lose my archive. Do you know a way to avoid this happening? I did click the widgets thing.
Kim @ TheBitterBall