I created my own template, but how can I add the blogger lightbox function on my template code

I created my first blogger template from scratch; However, the lightbox 
function doesn't work.

When, I click a img on my post, it go to the img url. I tried to activate 
the lightbox property on configuration > post, comments and share, but it 
doesn't to anything.

Is their any way to add a code to my template to add the blogger lightbox 
function?

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