Help with image viewing

Hey, I'm an admin on this forum http://horseisland.4forum.biz/ and my problem is this:
Users and guests can't see images on the forum, be it signature or an image i post on a reply. I went through the admin panel but couldn't find anything, how can I make users and guests see images? I may have missed something, but no idea what...

Try General -> Categories and Forums -> Click the by the forum you want to be able to see the images in (Probably all I'm guessing, But You'll have to do them one by one.) -> Permissions-> Change 'See images in the messages' to All or Members.