Just to clear things up: there are posts and pages. A post is a normal blog entry that appears in your archives and lives within your blog's main chronology; a page is separate -- it won't appear when you click on archives. With the theme that you're using, pages appear as tabs below the header image.
"Home" is added automatically as a page. If you want all of your posts to appear on the "die wahrheit übermich" page you have to do two things:
(1) make a new page named anything and set that as your home page under Options > Reading > Front page displays, then
(2) select "die wahrheit übermich" under the option that says "show the latest posts on..."
However, I don't think this will get rid of your home page. The "home" tab will basically be a mirror of "die wahrheit übermich," but you'll be able to have another page be the home page (the page that people see when they first visit your blog).
I don't think I'm explaining this well, but I hope it helps anyway ;)