I did an error!!! I posted something ridiculous to http:// pastie.textmate.org.

",NFD("たaaäÄüß $s\n")); Äá

How can I delete this? Or who can delete this?

Dreamer the guy that runs that site would be the only one that could delete it, don't think there is any way for you to do so. But don't worry about it it's just a site to post nonsense like that for other people to view, it's not a code snippet site so it doesn't matter that it doesn't make sense. Beyond being on the recent pastes page for a few hours no one will even see it. ;)