Admins who are trying to help: the rest of us do not see signature as an option under "your account." Fred, clicking on profile, name, about brings up the signature, but no option to edit. For reference, I am a contributing member, but not an admin.
Thanks, feeling better each day. I don't know about the serial number, I'll take a look. :)
Thanks.
Don't know about the image size. I thought it was limited just by the file size, which I limit to under 4,000 but I really don't know.