Make Twenty Eleven them 3 column- 2 sidebar?

Do not edit the Twenty Eleven theme. It is the default WordPress 3.2 theme and having access to an unedited version of the theme is vital when dealing with a range of site issues.

Create a child theme for your customisations. Once your child theme is active, we should be able to help with the customisation.

Hi esmi-

I’m sorry- I forgot to state that I did already created the child theme.

Thanks!

this child theme might have what you want; or at least you might be able to get inspiration from the code.

Then you need to start by reviewing Theme_Development.

I want to know how to get 3 columns in my twenty eleven theme

Here is a few suggestions:
1. You need to find the theme that supports 3 columns.
2. Create it by yourself or get a wordpress developer to do it.