the other way is to use the 'additional options...' below where you write your replies.
This will allow you to selected a picture from your drive without using a third site like photobucket (photobucket has limitations too, like it doesn't allow the posting of male cracks!)
It does however open up to a smallish picture that can be clicked on fer better (larger) view, and it requires that you write a short message - you can't just post a picture alone with this method.