How to change column numbers?

[sandsoncosta]

I've searched for ways to change the number of columns on blog and I haven't been able to.
I don't know if I searched correctly. I'm new to this.
Actually:

I would like:

[razonyang]

Tweak the hb.blog.list_cols_md and hb.blog.list_cols_lg parameters, read more on Blog's site parameters.

[sandsoncosta]

Thank you very much!