From what I understand TCS doesn't use HTML which is why you can't turn on the HTML tags.
To create a sig you have to make your picture using photoshop, paint shop pro or similar and host it on the net somewhere (lots of people here use imagestation) and in the user cp select 'user profile' from the top. In the 'signature box type [IMG]then the url of your pic, (eg. www.mycat/herpicture.jpg
) then[/IMG] that should sort out your signature. I use I love cats
to host my pics, it's free and they allow remote linking.
I hope all that makes sense, if it doesn't I'm sure someone else can explain it better (I'm not very technically minded sometimes).