As uploader, you can edit the torrent page for 7 days after the upload date / time.

Changeable are:

The title Add or delete pictures The description text

Not changeable are the .torrent file and the torrent's file list and the file names.

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How to edit a torrent page:

1/ Go to the torrent page (e.g. from your Profile's Uploaded torrents list))
2/ Locate the "Upped by  (Anonymous)"
3/ Click on the "[Edit this torrent]" there and the torrent page editor opens
4/ Change first pictures, then title and/or description
5/ Click the "Edit it!" button to save changes

Remark: the torrent page editor has as well options to delete the page and torrent. However this should be used only if nobody has yet started downloading or there are serious issues with the torrent's data files. Deleting the torrent will leave the downloading peers with unusable partly downloads counted to their share ratio.