You need to sign a blank sheet of paper and then Scan this either into Word
or a graphics editing utility.
Once you have it sized, save it as a JPEG or PNG and then insert it into
Word using Insert, Picture from File. Once in the document, select it and
save it as an AutoText entry assigning it your initials or part of your name
so it is at least four characters long.
Use it anytime from AutoText.