I don't know any password for the digital signature, nor for the various menu items for deleting same. I need a new digital signature file, or the ability to place my signature on a document, as I have done for years.

Deleting a digital signature requires some other password, which I don't have. It is clearly not the same one I use to log into this website.

I want to delete the old one and put in a new one, with a new password.  I have Acrobat XI running on a mac with OS 10.10.3.