there is a button that looks like a yellow sky, a grey mountain and a grey sun. click it and insert the URL from whatever image hosting place, and press OK
it will enter it like this in the text field you type in;
[img]www.photobucket.com/yourimage.jpg[/img]
the tells the forum where to START the url for the picture, and the [/IMG] tells the forum where to STOP the url for the picture.
you can do it manually, or you can do it with the button. your choice //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
good luck learning the internets.