How can I delete a signature that I inserted using Preview.app?
I can edit or delete all the text fields but the signature seems locked somehow.
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You cannot remove a Preview.app signature in Yosemite. This is a bug. It would almost make sense if signing a document froze the entire document,but you can edit every other annotation.
I've tried masking a signature with a filled box, then overlaying a signature on that. It seems to work and the document saves, but on opening tne new signature is gone. (Another bug.)
Even on Mojave it still seems to be the case that once you have saved the file and re-opened it, you will not be able to remove the image.
To resolve this I followed the instructions in Use Preview to combine PDFs on your Mac to add a copy of the blank signature page from the original to my modified document. I was then able to edit and sign that newly-added page and so complete the document.