Cameras nowadays take such huge pictures 47 inches and up. They want you to see you to be able to see high quality pictures on huge tv's, but you need to resize them for the forum. Eight by 10 is about the biggest you can make, but it depends on how many colors the picture has and other technical things. There are free programs you can download and you computer probably comes with a photo resizing program. Most cameras come with software for resizing pictures on computer, just figuring out what you have may be the problem. There are also some online sites for resizing
Resize Images online. Just don't make it too small.