How to display the description of an image??

Site URL: https://www.lazar.photography/

I have spent hours finding our something that should be simple, but I couldnt find the solution and hope someone in here can help me.
I have a lot of photos on my site, but can not get the description text shown. I dont care if if shows permanently or just when hovering over as long as I can show it (I need to add some text to credit the model in a given photo).
I use Masonry grid as design - dont know if that makes a difference?

Right now I havent added text to all photos, but guess it shouldnt make a difference

Hoping to hear from someone :-)
Happe Easter to all!!!
BR John

Use these code to show description. 

Thanks a lot Tuamphan - that solved the problem 🙂  (plus an upgrade to premium as I couldnt add the footer programming in the standard package)
BR John