Posts listed per page

Hi, so I've checked settings but I can't see if it's possible.

Some threads are 60 odd pages long, I was wondering if there's a setting I can't find that allows you to set the number of posts per page, so you can scroll more than 15 posts each page.

Thanks.

P.s. Do I have to write in German or is English ok?

Unfortunately that´s not possible.

The preferred forum language is German. But English is also possible.