This may be obvious ... but

[storms4real]

How do you delete your posts?

[Aηdy]

You can't. Either report the post (using this button: http://www.virtualteen.org/forums/images/styles/fblue/buttons/report.gif). Or press the edit button, and delete the text.

[Kiros]

There's not much of a reason to delete your posts, anyway.

If you posted something, you posted it for a reason. Whether your reason is still valid or not, your posts shouldn't be removed unless they cause trouble of some kind.

[sunsings]

good question what if you said something you regret and want it gone!

[Oblivion]

Like Andy said, if something becomes personal, or if you regret a post, you can always edit it out and put a few dots instead.
Although its preferable not to, and should only be used in extreme cases

[Aηdy]

good question what if you said something you regret and want it gone!

Either do what I already said or think before you post.

[Requin]

OK. I know this is solved.
But I want to ask this...

What if you accidently post something twice? (this happened to me once and nearly happened again, my computer didn't like me).
Is that a justified case to ask the post to be deleted?

[Underground_Network]

^^ Yes.

Just report the post; say "double post," and a mod, gmod, or admin will delete and/or merge the posts.

[Requin]

Good. That's what I thought. :-)