Featured Image Module Missing on Pages

Hey, I'm using the Infoway theme and I've noticed that the featured image module is missing on the edit page screen, it's there on edit post, but not edit page.

I'm using a plugin to add a portfolio gallery to one of my pages, when I'm adding a new item to the plugin the first step is to add a featured image, which I can't do as it's missing.

How do I add this back into the installation?

It should just be some code needs adding to the source files in the editor, right?

 

It's ok I've sorted it now.

For anyone else who has this problem here's how I solved it:

I added:

{add_theme_support( 'post-thumbnails', array( 'post', 'page', 'portfolio' ) );
}

After line 31 in the functions.php file via the editor.

Bingo, the featured image module is back