Try the bottom left "Delete" button after clicking the "Edit" link.

Thank you for the hint.

How can I delete or edit the first post in a new topic I started?

Sounds very simple, but I don't see any "Edit" link. Where is it?

I think nowadays there is a window of time during which you can edit posts, after which you would need a moderator to make changes.

I was wondering the same thing. It seems you can edit all posts except for the ones that start threads.

Is that a new change? For a log time people could delete the original post. Which was stupid. But they could do it.

At the moment I can't even post new topics though I can reply.