You have to reduce your pictures usually. I open my picture with paint. a free program on my computer.I hit resize and reduce to 20% and save . When I post on here I use GO ADVANCED instead of POST QUICK REPLY. type what you want,then scroll down to MANAGE ATTACHMENTS in blue box way down the page. Then just follow the drop down box. You can then hit the preview post or submit reply buttons. I'm not computer literate but I can do this so you probably can also.lol Like everyone says reducing the picture is usually the reason it won't post.Good luck. If I can help let me know.Posting pictures is fun when you learn how.