You don't need to use photobucket - you can add images direct when posting but they must be smaller than 256k so you will probably have to resize them
If you want to use online storage instead, just copy and paste the url or add img when in the full editor - click on the img button and insert your url in between the
I downloaded this piece of freeware when I first started uploading images direct to the forums. Works really well as you can batch an entire group of pics in one.