Hello,
You can edit your post by clicking on the 'Edit' button on the bottom right corner of your post. But then the 'Edit' button will appear only upto 5 hours since the time you originally made the post.
If you have posted something wrong - like a typo in your message, you can 'Edit' your post for up to 5 hours.
If you have posted the same message twice by mistake (duplicated), you may inform about it to the moderator by clicking on the report post

button on the top right of the duplicated message. We will take care of it.