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1. Upload your blog signature to a photo hosting site of your choice. Some examples are Photobucket or Imageshack.
2. Copy the direct link url of your image after you upload it.
3. Log into Blogger and click on "Settings".
4. Click on "Posts and Comments".
5. To the right, you'll see some options appear. You'll need to click on "Add" in the Post Template area.
6. After you click add, a text area will appear. You will need to copy the following code in that box.
<br /><img style="border:none;" align="left" src="SIGNATURE URL" /><br />
7. Replace SIGNATURE URL with your image URL.
8. You can change the alignment to "center" or "right" instead of left, depending on where you'd like the signature to appear.
9. Click Save Settings and you're done!
The blog post signature will now appear on all your new blog posts!