How Do You Attatch Picutres To Posts?!

[watchdog48]

Someone please explain to me, is there anything special you have to do in order to post a picture on a post? ive tried and tried, and even while im inside the criteria it claims i have gone over allowed space.
please help!!
thanks

[Nem]

Host it somewhere (http://photobucket.com/) and then link here either using [img] or [url] tags.