The direct link will work best. When you want to post a pic, it should end up looking like this {img}yourdirectlink{/img} except with square brackets instead. You can type the img tag like that or use the img function above the post text box (the one you use to make a post).

Next best option is to pm me the pic link, I'll put it in your post then you can edit to see how it was done. It may have to be a new post as you only have about 15 minutes to edit something you already posted.