Blogger vs WordPress Blog

site: http://www.mijnjaaralsjobhopper.wordpress.com ; Today 27 december my son accidentally edited the whole 'blog' page, while trying to add a blog post. It resulted in an added page 'mijn eerste job' which has taken up the place and internal links of the old blog page, and in a blogpost page that cannot be linked to, and that only shows up in the page list as 'not used'. Fortunately, all blog posts (including a new one which is the correct version of 'mijn eerste job') are still in the blog post list, and are accessible trough the archives-function. We would like to restore the blog page and repair the links (in the menu) on the welkom page. As we still have a wordversion (draft) of todays blogpost, a quick&easy solution would be to just restore the site als it was yesterday - I don't know if that is an option?If not, please provide detailed steps - we are no experienced users

The blog I need help with is ciliacielen.wordpress.com.