First, you need to have your pictures hosted somewhere. Once that's done, you need the URL that links directly to your picture. Then, if you want to put them in your post, the easy way is to use the advanced reply screen. Not the Quick Reply box at the bottom. When you're on that screen, just click on the Insert Image icon which is the little yellow box with the mountain in it. That will ask you to insert the URL for you picture. Type it in or cut and paste and click ok and it will imbed the pic in your post.