I can try...
First of all, you have to host your pics at a web site that supports linking. I use MSN groups, and I've found that yahoo sucks for that kind of thing.
Once you have your pics appropriately hosted, you right click on the full size image that you want to post here. Go to 'properties', the copy the URL . Pate that URL into the 'image' block when you're composing your blog, click 'ok' (it should insert itself into the body of text)...post your blog, and if you've done it right...voila! You got yourself a picture on your blog!