The Responsive Lightbox gives you the option to apply lightboxes across all your images. However, that option may be turned off and the lightbox effect may be manually used on each individual image. To manually use the lightbox effect on images and galleries use the instructions below as a guide.
Manual Usage on Images
1. Navigate to your Responsive Lightbox Plugin settings page by selecting Dashboard–>Settings–>Responsive Plugin
3. Uncheck the image links box and make sure you have text in the selector area such as “lightbox”. Having text in the selector area is important as that text will be used to apply the lightbox effect on images. The word “lightbox” is suggested as it is unlikely to interfere with existing plugins .
5.Navigate to the location (such as a post or a page) where the lightbox is to be manually applied.
7. In your link add the following code,
data-rel="lightbox"(or whatever selector text you used) after your
a href link but before an img tag. An example of code might be the following:
<a href="image_link" data-rel="lightbox">link anchor</a> You can see the location in the image below.