Thanks for updating the thread.
I am sorry for the confusion. As mentioned by my colleague it's not a featured offered by X Theme. However, while searching on the internet I came across a resource that should meet your requirement.
I suggest you to please take a look at following tutorial. I am also sharing the demo page link:
Please note that you will need to add the PHP code in function.php file. Rather then editing core theme file, I suggest you to please install child theme and then add PHP code in child theme function.php file. I am sharing few resources that you can use to download and setup child theme.
I also came across a plugin that you can take a look at add Smugmug images on your website, though not exactly what you are looking for but may help you in future. You can download the plugin from following source:
Hope that points you in right direction.