Kaptinlin Themes Support

Today we have one portfolio with four categories and five items in wordpress theme Striking (latest version). When we now want to add new categories and items we cannot make them visible when publishing the item/category. We have also tried to change featured image but cannot.
The link to our portfolio is: http://www.tangden.com/wordpress/chefsutbildning/smorgasbord/
Ideas are most appreciated. Best regards Anders and Helena