Plug-in to have posts into widget sidebar

Hi,
I try on genesis with outreachpro child theme,
tried with builder (site origin) and with sidebar custum, or woosidebar, but nothing run.
I want to have the bog (content part) in a right sidebar, but I found nothing for content in a sidebar. 2/3 space left for fix informations (page) and 1/3 right for news in a blog form, with pictures and text extract.
Every time, content is larger, center or not, but bigger than I want.
May I go to css, or is it a plugin who open this ?
Excuse my primary school english..
Thank you, Pierre

Here, for few hours if you look at, blog content will be placed in the right primary sidebar :
http://semaineduminervois.com/wp/