How to sign your post with graphic signature

1. create your signature with a graphic editor
2. save that graphic signature in your computer
3. write a new post and upload your graphic signature
4. publish the post (you save it as draft later)
5. open the post in the browser by clicking VIEW POST (alternative is to edit the post in the Edit HTML mode)
6. click on the graphic signature
7. copy the picture address (picture URL) from the address bar
8. Dashboard >

Source : bloggertipsandtricks[dot]com