I received a document in PDF format that needed a digital signature. I went through the process of creating a simple signature in text only while still within the document, but had a typo in my name. Now I can't seem to be able to edit or delete this signature file. I then launched Adobe 8 on my computer and created a signature file using Edit > Preferences > Identity with the correct infomation. However, the incorrect version is still being used without any ability to choose a different file.
You should clear the signature and then re-sign. You should be able to clear it by right-clicking and selecting "Clear Signature". When you re-sign, select the newly created signature appearance.