Posting graphics is a bunch of fun, and attention to detail is what gets it done!
Your last attempt was missing the quotation marks at the end of the URL string, right after the ~.gif~
Once you've been doing it for awhile, you'll wonder how you ever managed to exist on-line without it!!!
Here's the character string for this decal:
< img src="http://www.militarywives.com/milwives/images/items/d84-a.jpg">
Do a right-click of your mouse over the image and select 'properties', and look for the URL Address to see where an image is from. It'll give you ideas for looking for images of your own to post!