All howto's I was able to find in the Internet is slightly (or even not slightly) different from the things I see in my real account. This things is also applicable to the official Google help pages (!).
Where's the right place of this setting?
I think this process has changed with an update of the Analytics Interface.
You can find the Timezone setting for each "View" of each "Property" under each "Account" you manage.
Until the next time the interface is changed...