Mystique theme: How to make post image link to post and not itself

Hi all,

just started using Mystique theme, and although it is fantastic, it is SO difficult for a novice like me to tweak! The problem I have is that an image put in a post links to itself (a light box, or a larger view of itself) but I need it to link to the post that it lives in as I want the category page to display the image as a link to the FULL post on single.php rather than making it larger.

I am new with this, and having looked around the new extended Mystique theme, I am LOST!

The thumb nail on the gallery format seems to link to the post rather than itself, and it is this that I wish to do.

Any help with code would be great. I think I need to use: wp_get_attachment_image and add permalink() in somewhere, but really not sure where or how?

my site is https://www.atinymind.co.uk/test

Any help would really be appreciated.