Installed theme pages not visible in wordpress

hello,

i installed a theme in my wordpress and also activated it but i dont see any single pages in there to work on. The browser view also show only some kind of blog-test-page.

currently it looks like this:
https://mreiner.bplaced.net/wordpress/

but i expected something like this (the theme that i installed):
https://demo.alienwp.com/ascetica/

Did i something wrong? or forgot something?

Cheers
Joerg