Thanks so much for the guide, it's great!
I have a question: I'm just about to make my first post and in the editor I have put:  in the hope of getting a particular image to show up. In the preview box I can see that an image is there, but I can't actually see the image itself, it's just a box filled with a faded-out drawing of a UFO. Is that how it is supposed to look, or have I done something wrong? Thanks in advance for any help.