Upload your pics to your photobucket account - its free by the way - and once you have done that you copy the link to the pics into your posting - see below for a more detailed guide:
With the picture on screen - as you can see below in a screenshot of the photobucket page, select the text from within the IMG Code- Forums & Bulletin Boards box at bottom right of screen (as labelled in picture below) and paste the text into your posting where you want the picture to appear.

So - this is how the posting above looked as I was typing it and after I had pasted in the code from the picture on photobucket.

Hope this helps - if not let me know and i'll do a more step by step guide including uploading to photobucket and putting the pics into your postings