To remove attachments from a page, go to the "Tools" menu in the upper-right hand corner of the white portion of the Answers page and then select "Attachments."
The list of currently attached files will appear. In the right column of every attached file row is a link to change the properties of the attachment or remove it. Click on "Remove" to remove the attachment.
You will be prompted to click "OK" to confirm that you want to remove the attachment.
After you click "OK," the file should no longer appear in the "Attached Files" list.
From the same screen used to remove attachments (see above), you can change the properties of an attachment.