It's just a simple step to do this, it may look hard for newbie but once you look through this step. It's will be just be a click of a mouse.
To change the size of your entire blog:
Step 1: Log into your blog account
Step 2: Go to Template - Customize
Step 3: Go to Adjust Widths
Now you can adjust the with of the entire blog or even the left/right sidebar's width.
Isn't it easy?? Now go try it yourself.
