BBCode markup is the code used for colors, size, font, etc... - the stuff in the [ ] brackets.
I can't help you on un-animating the gif.
Thanks Steve. A fellow member un-animated the GIF for me, what I don't understand is why can't I delete the animated GIF, which is acceptable in my current sig with no BBCode faults, and replace it with the un-animated one.
I'm not trying to change anything else. I'm starting to get the feeling my computer doesn't like me.
The animated one that is in there now should be within some brackets that say "right" - "/right". If you delete what's in there it will go away.
I think you will have to upload the new one through the signature picture section in "edit signature". You can then bracket it where the old one used to be.