A plugin to display slideshow in a widget with title, description and custom link from page or post gallery.
When you edit a page in the admin you should look at the url. It would be like this: http://www.mydomain.com/wp-admin/post.php?post=144&action=edit . In this example the number 144 is your post/page ID.
Please clear the cache of your browser (ctrl+shift+del)
Insert it in to the post and switch to HTML. There you can see the attachment id. If you do not need the image in the post, you may delete it from there.