Open two browser windows, one with your imagestation account with the pic pulled up that you want to add, the other window should be the Beemaster window that your posting your message in.
Type in the message you want to display, click on the "img" button above the text box your typing in, right click on your image you want to post, select "copy image location" , right click back in the text box of your message and paste, click on the "img" button again and submit.