How to insert a signature field that requires a certificate to sign

I found a solution!  It appears that the certificate option is not a default option in my case possibly because I  converted a word document to a PDF.  The signature form field would not allow a certificate signature, just a normal field that behaved just like a normal text box really.  I have a different pdf from a bank which does allow me to create signatrue form fields with a certifcate.   It's in the same place on the left bar as the other signature form field with my converted word doc, except that it produce a form field with a certificate.   The only workaround I found was I had to click on the small tool bar to the left, its like a shortcut bar with only about 4 options on it that are symbols.  I clicked on the "..." at the bottom, and it gave me the option to "customize tool bar".  I selected that option.  Then I scrolled down to "prepare a form", opened up its options, and there was the option to add "Digital signature" which was the same title as the digital signature i already had that wasn't working but the symbol was like the digital signature from the bank PDF that was working.  So i clicked the "+" to add it to the toolbar and it works!  When i click on it as a user, not an editor, it pops up a box asking me to add a certicate signature with a time stamp, just like I wanted.