Hello! I'm going to create Scratch Forum in Polish.
Where can I get this forum style? I know I can get wiki style, but can i get forum style, too?

Yes, but we can create topics only and we have one forum for topics. In English there's 10 or more forum. We need more place So it's the same question as my last with wiki - how can we set forum so that it looks like this here?

You could look around for a free forum host and host a completely separate forum there, e.g. on ProBoards. It won't look like this one though. If you want it to look like this forum, you will need to find and pay for a webhost and then install Django etc. There will be some programming skills needed. I don't know if this forum is open source (so that you could have scratchblocks).