I am using blogger, for blogger I think you go to Setting - Formatting - Post Template, n paste HTML in the box... It works, but I am not sure if you do mobile blog... It seems the signature comes on top, if you blog from the computer, then it won't be a problem, but I don't think you can control that from mobile device... I hope it helps you though!
You can create an image with a nice designed signature and add it to your template... There are many places you can use and most are for free.. Hope I can tell you which one I used but I don't remember and neither I saved the link :( Can't wait to see yours! :)
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Brittany is a director of the Toxic Free Foundation and created the first ever Toxic Free Certification Program. Weekly, Brittany publishes the Toxic Free Blog and provides coaching to over 10,000 families in the United States alone. She is the author of a Toxic Free educational series and co-author of several Toxic Free learning programs. Brittany is also an award winning author.