With the current theme, any galleries will be nested/posted below the main picture. If you can’t see it just scroll down a bit and it should be there.
To view the photos in the gallery, simply click on the thumbnail and it will load the gallery.
To exit just click on the Close button or click outside the lightbox in the dark area and it will take you back to the current page/post.
Photos may take a bit to load, so be patient and let it run its course. It should pick up speed the more you go through them.
If you have any other questions please leave a comment to contact me.
Thanks and enjoy!