How do I delete threads I have posted?

Someone please tell me

You can't. Moderators will do that for you

you can delete a thread but only if no one has posted in it

use the "edit" button

I tried that but when I try to delete everything it says message too short

When you press EDIT, check on the lower right and you'll see a 'delete' option; click on that one. I presume you were just cancelling your original post.

i dont see the delete button, it only appears when i try to edit this message, it doesnt appear when i tried to delete my post and get rid of my thread. I posted it twice on accident cause i thought it didnt post the first time....

If you accidentally double post, just edit the original post in one of the threads and ask for the mods to delete it.

It shows it was an accident and that you're trying to fix it :P