facebook og:description

hey,
i want to change the description which facebook shows, if i share a link of a blog-site. i already know, that facebook takes the description which is shown in og:description. but i didn’t find a way to edit this one.
the facebook-debugger shows this page: facebook debug

i dont need a different description for every site, i just dont want the ‘Du kannst folgende HTML-Tags benutzen:….’ stuff.

thanks a lot!
magnus lenz

http://ww.wp.xz.cn/plugins/styles-twentythirteen/