1. See my post on page two of this very topic, "A note on signatures", for information about disabling signatures and/or signature images.
2. See my post from 8 Aug on the topic stickied above, "Announcement: Latest Updates - please check to see if you're missing out!" for similar information.
3. See the option on the profile page (image below).
4. In hopes that you manage to read this reply, here it is yet again (showing my personal settings):
