Tapatalk app would make it easier to load a photo from your phone, but your other option is to load the photo to your gallery here or a photo hosting service, and then use the picture direct link with the "insert image" option in the thread.
90F is the hottest spot I hope, and there is a cool area on the other side? If not he might be getting way too hot. Just make sure it's only 90 on about 1/3 of his enclosure and he should settle down after some time getting used to things. High 70s to very low 80s on the cool side is best.