So far so good :)

Looks like you have the image posting down pat. My directions are generic because other people prefer to use something else besides Photobucket and I don't know what their choices are so I don't incorporate the little "copied/paste" trick. You can do the same thing with the link that you originally did but you have to use the IMG button on the editor instead of the URL button. Place the address between the IMG brackets.
The way I do it saves a step because it copies the IMG brackets at the same time.