How do I remove a digital signature from Adobe Acrobat Pro. I have set it up wrongly.

I created a digital signature but I wanted to change the signature and it also was not password protected. So I deleted the signature but cannot delete the certificate to set it up again.

Mac OS X (Operating System)

So I am unable to delete the digital signature in Acrobat Xi pro.

I did the following: Adobe | Preferences | Signatures | Creation and Appearance Preferences and deleted the signature. But Adobe | Preferences | Signatures | Digittal ID and Trusted Certificate Settings, does not want to delete.

Tank you.