For youngunz - " ... i know how to attach but do not know how to make it display ..."
As you guessed that is easy also. Just grab the attachment URL up to and including the attachmentid and surround it by IMG tags (or use the Insert image icon), and you'll make it display just like any other image.
For example, this code:
[img]http://thefiringline.com/forums/attachment.php?attachmentid=82231[/img]
will yield this for you:
