Try this update:
1) Login to your Dashboard:

2) Click "Layout" tab and go to "Page Elements":

3) From the layout, click "Edit" on the last element on the page:

4) Add the online audio advertising HTML code to your blogger template:

5) Click "Save" and your advertisements will play on your blog.
For an example, I have the code at on our
Online Advertising Blogspot blog.
Let me know if you have any problems. Hope this helps!
