How I can resize the 2nd column?

First of all, I would like to say thanks for the beautiful job and for amazing template.

I have some problems, but these forum is very rich in information and I almost figured out about Pinboard Theme.

But, I didn´t find how I can resize the 2nd column. In Theme options > Geral, I use the first layout template ( content /sidebar ) but when I installed “minitwiiter” plugin, it look like different when I saw with the demo.

My site is http://www.flaviopavanelli.com.br

I appreciate all help!

Best regards from Brasil!

Flávio