If you have forgotten the password, you cannot delete the ID from here. When you click Remove ID, the Acrobat Security dialog box shows the complete location of the digital ID file. Go to the location, delete the file, and then relaunch Acrobat. The ID is removed from the list.
Thank-you so much for reply. It is very thoughtful of you because I was pretty discouraged and had now way out of that digital labyrinth.
I had no password for my Digital ID becaue when I set it on January 12th, 2021 there was none given or asked to decide create. Anyway, it was created and registered on my computer automatically through various steps.
Thanks again for the solutions link, but I had decided to solve my problem by uninstalling the PDF reader I had because I was 4 hours fed up, hopeless and unhappy with Adobe not offering a help chat or phone number. So, I removed my Adobe Acrotbat Reader XI (11) and reinstalled the new version Adobe Acrotbat Reader DC and then added a new Digital ID. Again no password was asked to be created when I followed the steps to create an authentication signature on a PDF I had to sign.
I will keep this link for futur needs that I am positive will be required when I am unable to sign a futre PDF.