How to increase your blog width?

If you want to increase your blog width within maximum width

1) Go to Design->Template Designer->Layout->Adjust Width

If you want to increase the blog width beyond maximum width
Go to Design->Edit html
find the line
 <b:variable default='930px' name='content.width' type='length' value='970px'/>
replace 970px with the value you want, such as 1200px, then
click save template. Done!

I increase my blog width for  better Video and TV performance as
below:
http://tv-movie-music-online.blogspot.com/