I'm hoping this is easy. I have some pictures in a gallery. When you click on a thumbnail it opens the picture in a page, within the theme, click again and it shows the picture direct linked (just the picture). I've seen on other blogs, like the link below, that you can have it such that clicking will go to the next picture in the gallery. I can't for the life of me work out what option I'm missing...
The blog I need help with is mcfromnz.wordpress.com.