No need to feel that you are bugging anyone. We all have to learn.
To put a piece of clipart into your post, simply find a picture that you like, then find its URL. (Right click on it and select properties.)
Next, once you have the URL, simply place {img}Insert The URL Here{/img} in your post, and your clipart will appear. Don't forget to put a [ and ] where I have { and } .