Theme Horse

Hi schererdagmar,
If you want to install attitude theme then, please post in the attitude forum on the next time.
Goto http://wordpress.org/themes/attitude

Then you will see the attitude theme and download it.
after it go to dashboard -> apperance -> themes -> click on add new > click on upload -> add your zip attitude theme and click on intall

then you attitude theme will be inside dashboard -> apperance -> themes and click on activate, to activate the attitude theme

Thank you!