Look at the title!

mabey i think you just delete your first post
closing i dont know how

You can't delete the first post though, you can only delete the posts u've made after the starting post

well you can close a thread but i dont know how

PM one of the moderators of said board.

Alternatively, see if you can report your own post.

If i report my own post I might get an infraction or ban.
I'll try talk to people in the Toribash IRC chatroom.
So i won't be looking at this thread anymore.
Thanx for the help!