x2 photobucket is what I use. Up load the photos there. Hover your mouse over the picture you want to post. There will be a sprocket or star that will appear in the top right corner of the picture. Click on it and then click on Get Media Links. Go to direct link. Click on the code and it should then say copied. Come back here and right click and paste or ctrl v the link between these brackets [img][/img] and the picture should show up nicely resized and everything. Like this
Also, when you go to quote someone's post, the coding they used to post a picture of video appears. You can use that as a reminder or to figure out how someone posted something special.