What licence for LibreOffice's screenshot in my blog post

I read documentation about licence, creating common…, LGPL, MPL. But i don’t know how to be fine… I would like write blog post with LibreOffice screenshot. My blog post may have third party image from Fotolia. Is it possible? and what licence apply :
For image ?
For Blog post?
and What mentions apply?

hi, have you seen here?

Is your blog copyrighted? I don’t suppose so.
I may be wrong but I don’t see a screenshot as an infringement of license.