Modifying the edit signature page
 

I want to like add a icon to WYSIG or something..

Not sure if this is mod or style, but I posted here.

Basically at the moment I just have above the signature..

"Want a dynamic signature? Copy this code.
[*img]http://domain.com/sig.php?user=(there username)[/img]"

But I want like a button or something they can press and it'll automatically add the dynamic signature to their signature.

Would appreciate it if someone could help me with this, thanks.

edit.. forgot to say its 3.8.6