A.You can only post an image that is already on the web if you want to use a picture that is not you will have to upload it to a photobucket/ image shack or even your facebook page.
here we are going to copy the image of a donut.
when you select your image you want to include 'right click' and select 'copy image location'
Then return to your reply/message and click the and two bits of code appear in the body of your post, now get in between the two lumps of code, (just after the [ img] and before the other one) and then right click again and select paste.
the body of your message will have loads of code in it, don't add gaps in this code but you can centralise it by highlighting the code and then clicking (this will put the
code either side of all that stuff)
To see If you have done it right, click the 'preview button'