Sure, you're welcome...StockCharts works differently - - Here at iHub and at other chart and image sites you can just copy the image URL, paste that into your iHub message, hi-lite it and then select 'Image' for it to show in the post (example - certain Google blog charts will work that way)...
Either way it's easy enough to get 'em to show after you do it a few times. It just takes a few more steps to save to your machine first and then upload to iHub...