Why does big Think not allow upload of a jpg?

No matter what permissions I allow my browser to grant, I cannot upload a simple graphic to illustrate an important point! the supposed link http://www.bigthink.com/create-idea/step2 simply will not respond to any attempt to upload a graphic.

When I am logged in and try to go to Help, I am not allowed to post any question. Despite logging in over and over, posting to the help forum is prohibited. 

 Can anyone suggest why this might be? Are Big Ideas always text-only ideas?