On https://www.more.com/tickets/cinemas/, each film has its own page showing all screenings of that film at all More partner cinemas.
If you can't see your cinema's screenings on this page, check that in the production you created, in the "General" tab, you've selected the film in the "Film search" field (search the film database to fill in the page content).
In this field, type your film's title and select it. If you can't find it by its Greek title, search for it by its original or English title.
This way, the screenings will be added to the film's general page automatically.