How to adjust the width of "posts" Emporio blogger theme

I want to adjust the width of “posts” Emporio blogger theme and make the sidebar big like that of the stream menu, Any help.

Blogger Dashboard>Theme>Advanced>Width

@ mrvoke, i don’t mean the stream menu, i mean this

Am still waiting

It’s an advanced modification to the theme…

Please, can you tell me the advanced modification method ? please i need it

For now, I can’t…

Ok, No problem