Kaffs, as you are a VIP you can upload from your laptop. On the Post Reply box click "Add Attachments" This opens up to the files on your laptop and you then need to locate your picture. Once you have found it click on Open and wait for the picture to be uploaded. You should eventually see a green success bar on the File Chooser box.
Assuming you want the picture to appear as normal in your post click on the check box by "Insert all photos..." Then click on Finished and you get back to the post reply box.