You'll have to upload to photobucket or another online host site, then insert the codes they provide into your post (making sure the image's size isn't more than around 650 pixels wide, either resizing on your computer before uploading, or getting the host site to do it for you).
Note that the links stop working if you move or delete them from the host, as demonstrated above
All the world seems in tune on a Spring afternoon, when we're poisoning pigeons in the park.