Just click on "Upload an image" (found beneath the body of the post) and you'll be able to post whatever pictures you wish. Keep in mind that it is often hard if not impossible to identify varieties simply by a picture, but if your flower is unusual in any way, some guess might be had. Give us all the information about the plant too. Also, while you are doing all this, take a moment and go to your "Profile" and update your public profile, adding your location. City and state are most helpful but the USDA zone is better than nothing.