If you want an image to show up when you post in the forums, or when you chat in the room in your PM box, you need to upload an AVATAR instead. Just click on the word 'avatar' directly under the "High Speed" option on the main page.
A profile photo, in comparison, only shows when someone accesses your forum profile. You may upload a photo for that profile by clicking the word 'photo' on the main page underneath the menu that selects the room you enter when you go into the chat room.