I posted a new topic twice by mistake [SOLVED]

I posted a new topic twice by mistake. How can I remove the unnecessary one?

there should be a little cross at the top of your post which should allow you to delete the post...if i see it i'll delete it for you

Thank you for help, Steph! I thought I could delete only posts by this little cross, not a topic.

you'd been able to delete the topic with it being the only post in that topic.