[HELP] No button to add signature

[Tenebris_Kane]

I have wondered this for a while but in my profile settings there is no botton to add a signature, I have confirmed with Wartty that I have been looking in the right place but the button definitely appears to be missing. It's not a major problem as I don't even know exactly what I would put there but it seems strange that I don't have the option. Therefor I was wondering if there is some hidden requirement for signatures.

Thanks in advance for any help or info you can provide