Hi guys!
Good job on ZP.
I might be stupid, but where or how can I activate the News feature? I installed a fresh copy, everything went fine but there's no NEWS section..

You have to enable the zenpage plugin and your theme must have support for it.

I tried, couldn't find it anywhere in ACP.

No idea what ACP means. But if you can't find the plugin to enabled you did not correctly install Zenphoto. It is a standard plugin included. Or you are using an really outdated version …

If it is enabled you may also need to enable the news feature itself on the Zenpage plugin options. You can enable pages and news or one of each individually. Some sites may only need one so it can be hidden from the backend.

I've installed ZP on 3 different sites, can't find the plugin anywhere -> can you tell me how to install it manually?

Go to /admin
or
/zp-core/admin.php
and login on your site.
Click the "Plugins" tab and find the "zenpage" plugin.
Activate it and hit "Apply".