OK, here's how I do it:
First, right-click the button you want, select Save and save to your computer. If you want to make it a link, upload it to your favorite photo site (I use photobucket).
Then go to your Blogger Dashboard, select manage Layout.
If you just want the picture, you click "add page element," select add picture, hit "Browse" find the picture, hit OK, and follow the directions to get it on your side-bar. Then you can drag the item up or down to where you want it.
**a href="http://coffeeswap.blogspot.com/index.html" target="_blank">**img border="0" alt="Photo Sharing and Video Hosting at Photobucket" src="LINK TO YOUR PHOTO "/>**/a>
But put a < in place of the **, and the link to where you have the image hosted after src=