A Signature is a fun way to customize your blog and it is easier than you think!
You need to create your custom signature in the program of your choice, I use Adobe Illustrator or Adobe Photoshop. Make sure that when you save your signature, you save it as a png file with a transparent background. If this is a step that you can't do yourself, or don't want to do yourself, email me (firstname.lastname@example.org), and I can design you a custom signature for your blog for only $10!
Create a Photobucket Account (www.photobucket.com)
Upload your Custom Signature.
Click on your signature.
A similar screen below should show up. Copy the HTML Code for your signature.
Return to your Blog and go to your Settings and Formatting Section.
Scroll to the bottom and you will see a Post Template section, in the box, paste the code that you got from photobucket. Then Save.
Go to Layout and Edit HTML.
Scroll down to where you see the below text, and change the border to 0px. Then Save your template.
And you are done!