unfortunatley this bullshit-forum killed all my html

No, it rendered your HTML. Just use "<p>" at the start of every paragraph, and "<c>...</c>"* around blocks of computer text (code, data, input, output).

You obviously know HTML, yet you're advocating having to learn yet another variant of UBB's markup to post here. That's a step backwards.

* — You could use standard HTML tags for code blocks too, but <c>..</c> is much more convenient since it handles escaping "&" and "<" for you.