Really quite simple. This new style bb code allows all kinds of wonderful things.
I have a picture uploaded to an online server -
It has an address of:http://www.cleancomp...b/CubCadets.jpg
If I want to show the image, I highlight the url then click the img button at the top of the post a reply window. It then brings up a dialog box and you can paste in the url. Click ok and presto bang there it is.
Remember, you have to have the images loaded to some kind of server on the net.
Your ISP should give you at least 5megs of personal webspace to use, then you can use a program such as ws_ftp to be your ftp client. Your ISP can help you set up your webspace and it will only take a minute and doesn't cost anything as it is included in your monthly bill.