Thank you Tom, that helps.
Just to make sure I got it right: I take a static page for my WP Show Posts blog archive, and with the help of WP Show posts this static page will be my archive page??
What should I customize in the start page settings?
So I don´t have or need an archive page anymore?
This is a bit confusing to me….
Sorry, I am just a wordpress user for my own page, unfortunally no webdesigner or css crack …