There is now a new way to add images to users’ posts on this website so that readers can click on them to open them in a new page and increase their size.
The picture below has this functionality. Try clicking on it to see what happens.
To do this with your own posts, when you upload a photo file on the “add media” page, in “attachment display settings” choose link to “media file”. I would also recommend you choose the full resolution option during this file upload process.
The picture below is a screenshot from a website that gives more information on the WP Featherlight plugin and how this works. http://seehowsupport.com/wordpress/content-editor/click-to-enlarge-images-in-wordpress/