Forgot to add one thing: when I go to Edit>Preferences>Signatures>Digital Signatures>More>Appearances I only see ONE (1) signature in the field, which is the one I need to be able to use as default for all this user's documents.
"Standard Text" is the default appearance that Acrobat uses; it is not shown in the list of custom appearances but it is always available in the "Sign" dialog. When the "Sign"dialog is launched, it always shows the appearance that was used when the last signature was signed. Once a signature is created, its appearance becomes a part of the signature and cannot be changed.
When you click on the "Appearance" field in the "Sign" dialog you get the drop-down list with all your appearances (including the "Standard Text"). You can select the one you want (e.g. your appearance) and it will be used for this signature. The next time you "Sign" the "Appearance" filed will show you the name of the appearance (your appearance) which you used in the previous signing.
Ok I see what you're saying, however, I can't click on place signature and use the drop down triangle option . It's not there. Is there a way to make that option available? to be able to change or clear the saved signature?