I have tried to add something extra to my signature, but when I try to preview or save it, it comes up saying:

The following errors occurred with your submission:
You have included 4 images in your message. You are limited to using 3 images so please go back and correct the problem and then continue again.

Images include use of smilies, the BB code [img] tag and HTML <img> tags. The use of these is all subject to them being enabled by the administrator.

???