There are some good posts somewhere in the archives, if you search for the subject you may find it.
You need to upload your photos (in jpeg format) to an account (I use comcast.net) which stores each picture with its own URL (a file name and location identification). This photo file can be transferred to the site by typing it thusly:
You must substitute brackets where there are parentheses(can't put the letters between the brackets or it will attempt to load a picture):
[ ]http://name of storage site/~your file site/picture name.jpg[ ]
For example (my file site is not authentic)
(img)http://home.comcast.net/~wsmorrison/merion18.jpg(/img)
Remember to substitute brackets for the above parentheses