What version of Acrobat are you using?
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After I posted this question I found the answer. I will post the answer here in case it helps someone else.
I am using Adobe Acrobat XI standard.
I kept clicking around and under Edit/Preferences I was able to find Signatures. In that screen I found Identities and Certificates. I clicked on More and I found the certificate that I already have. I tried to delete it but couldn't because it wanted the password that I can't recall. So I clicked on Add ID and clicked the button to create a new signature. Then it gave me two options for creating the certificate. The one I chose was to use my Windows ID to authorize the certificate, which means that I don't have to have a password.
After I created the new certificate I made it my default, returned to the document I wanted to sign and it worked, just like before. Victory!
Thanks go to the person on this forum (can't recall the name) who told someone else that the PW cannot be changed and that I needed to create a new certificate. Then I just needed to figure out how to do that.
I struggled a lot to create a new digital ID because of the same reason. The issue is that you can not see the field for password confirmation below password field and so not typing anything there. Basically, password that you write do not match with confirmation password unseen below. After typing password, click tab on your keyboard and retype the password even though you do not see it on screen, and then click OK.
Thanks for posting this response, I was going through postings which were no help, but yours worked! You saved me so much time, thanks!
Oh Hallelujah! I'm using Acrobat Pro 9.0. I read your reply and used it to figure out how to make this work for the same situation but in a different version. Bless you for posting it!